Often your insurance will demand certain CERTIFIED minimum requirements with your insurance premium going down the more you meet their requirements.
And those requirements don't have to make sense or be best practice but they are the difference between your insurance company paying out and not paying out.
If requirements made sense, we would LONG since have had HD camera's recording to HD's rather then very very very poor camera's recording to low quality tape. But your own 4k mug shot and tricorder scan of the perps DNA and entire social history will see your insurance claim thrown out with a scornful laugh while a certified wobbly 320x200 etcha sketch will get you fully re-imbursed.
So: First check with your insurance company.
Next: Crime prevention is about denying criminals what they want:
4 Low risk
So do stop criminals make their crime be
4 High risk
5 Non paying.
Your shop needs a door and to be inviting it needs to be airy and this is done by making it out of glass. But a glass door is easily shattered. A wooden door with two large glass panes separated by a wood bar in the middle is ALMOST as inviting but now the burglar either needs to remove the door, open it or climb in through ONE of the smashed panels. This is slower. He will still get in but be able to steal less in the same amount of time. This makes it less profitable.
Shutter I mean one of those rollup "fences" that drop out ofthe celing, no idea what their english name is.
One thing you could do for instance is leave your display window open but install a shutter inside the store itself as an additional barrier to overcome. Barely visible during the day, at night an extra barrier. Many people place them infront of doors but this just requires you to lift the shutter, then bust in the doors that tend to open inwards.
Place an electrically lowered shutter BEHIND inwards opening doors, how do you open that one without a key? You can't push the doors in because the shutter is blocking that and you can't lift the shutter because the doors are in the way. Remember, theft prevention is like preventing being eaten by a lion, you don't need to be able to outrun the lion, you just need to outrun your neighbor.
Hard is similar to slow of course in that you make the burglars work just that little bit harder. Just one more lock, just one more barrier to overcome. One thing we as consumers hate is those plastic wraps around products but they have a simple reason. They are very large meaning it is hard to conceal for shop lifters or at least conceal as many. And they are hard to open to make it hard to open them and take their contents. We know this works because well, we all bitch about how hard they are to open. Most of the large plastic containers are pure theft prevention and contain a fully serviciable selling/display package inside for shops that don't need to fear shoplifters.
Do you NEED to store all your most valuable products in handy to carry containers right near the entrance to the warehouse? Or could you place your most expensive products on the highest shelf in the furthest corners? And lock up the ladder? And add some barbed wire to the shelves for those trying to climb it?
Think of shoe stores, if they are smart, they one have either the left or right shoe on display. Putting both the right and left shoe in the same size outside is asking for it but how many shoe thieves are interested in only left side shoes? I don't know if this was purely accidental but I did once notice that all the shoe shops in one area all had only the left shoes on display.
Expensive might be a little less clear but while you might think that a prepared thief can cut through any chain in any case you might as well get the cheapest available, the simple fact is that not all locks/chains etc are the same. And the better ones require more expensive tools and burglars don't tend to be rich. If your lock requires a 1000 dollar grinder to open vs a 50 dollar one, at least you know you are dealing with a pro. Or your neighbour left his toolshed unlocked again.
Risk is not something most criminals worry to much about, if they did, they wouldn't be criminals BUT even the boldest thief has another think if he sees his mug on hirez display. Run a monitor in the shop showing (some of the) security cam results. Don't SKIMP on the hardware, if the burglar sees his face isn't recognizable, he will know it won't be recognizable in court either. DNA showers don't stop thiefs but they make it easier to capture them and that is a risk if the warning is displayed and the thief isn't sure it is worth the risk.
Payout for a thief means finding lots of high value (as in the street sell value) items that can be easily taken, transported and sold without being identified. There are relatively few art thieves because while say the Mona Lisa might be easy to steal and transport, the changes of selling it without being found out are next to zero. There aren't that many thefts of sewer pipes either because while they can be easily taken and sold, transporting them is a pain in the ass.
And of course, a thief can't steal what isn't there. Do you NEED all your stock to be at your store overnight?
Many a place with an arcade or gambling machine has a notice in the window that the machine is emptied each night. It is more work but the message to the burglar is simple, there is no easy cash available. The thief can still steal everything else but those who simply want a cash grab, will look elsewhere, hopefully.
And finally, here is some of the simplest advice: If you can, ALWAYS get the highest floor in an office space. No burglar likes to climb. A ground floor office might look swanky to your customers but essentially you are fishbowl of hardware for easy grabbing. Same with stores, the more open and easily accessible it is, the better for the thief at night. There are offices/house/shops that are NEVER broken into despite their contents simply because of location. If you are in a shopping center, leave the OUTSIDE places to those who need them, the more inside you are, the more you are protected from all to easy access. Just take a look at your district and see where the burglaries occur. Then don't move there. It is simple.