Apparently I've taken a more radical approach than anyone else. I have stopped sitting upright at a desk to type on a computer. Nearly all of my time using my laptop is done in a fully-reclined chair. I am nearly supine as I type this. The built-in head & neck rest on the back of the chair fully supports my shoulders, neck & head. My upper arms, elbows & forearms arm supported by the backrest & padded arm rest. The laptop itself is supported by a cheap plastic laptray. The laptray has pockets on either side that serve as legs. The laptop is separated from my lap by an air space of about 2". The tray pockets hold pens, small pads, TV remotes, occasionally a can of Dew or a bottle of beer (if either tips, the liquid goes into the tray pocket & nowhere near the laptop.)
If I gaze straight ahead from this relaxed position, my line of sight is about 2" above the top of the screen. I wear bifocals. The screen is about 30" away from my eyes. I had my ophthalmologist adjust the prescription for my lower lenses to allow me to read materials from 30", not from 20" as is typically prescribed for reading glasses. The bifocals are the lined type, so the entire plane of the laptop's screen is viewed through the same lens prescription. I once tried using lineless bifocals & found with them I could only see a small fraction of the screen clearly. I had to continually move my head to focus clearly on the screen. The projected line between the upper & lower eyeglass lenses lines up very closely with the top of the laptop's screen. So I can see distant objects past the screen clearly without moving my head.
When I use a desktop scanner, I have to sit or stand bent over at the desk as most anyone would do. My land line phone is on the floor below the right arm rest.
I am retired, so I have to justify my arrangement to no boss who might perhaps believe I am too comfortable to be really working. If I stay up too late at my laptop, I tend to fall asleep in my computer position, it is that comfortable.
A couple of my hobbies are genealogy & local history. I travel around the US to do this & sometimes find I need to work my laptop for several hours at a time to catch up on email and type up my discoveries while they are still fresh in memory. I bought a folding recliner chair, similar to what is sold for use on patios, where a mesh fabric supports the body. I use a small pillow to provide more support for my head & neck, but otherwise it's very similar to my home recliner. This works almost as well as my home recliner.
I think the foundation of RSI for computer users is attempting to sit upright and pound on a keyboard, with minimal support for the arms & wrists. It's an unnatural and pain-provoking position, dictated by the all-too-human thinking of "We've always done it this way."