I'm in BC, Canada, and pretty familiar with the program that is promoted here: https://firesmartbc.ca/wp-cont...
There are multiple facets to it, but it boils down to making a property, or at least the structures on it, defensible. It's not just a single item, though starting with the riskiest items first is going to help right away. Vegetation around the home is one aspect, and construction style and materials are important as well. (e.g., cedar shake roofs are pretty, but consist of kindling that catches and holds the burning embers.) The program focuses on an immediate priority zone around the house, then moving outward from there.
Blowing embers landing on decks and roofs are one part of it, but also things like fences attached to homes, where the ground fire catches the fence, and the fence just burns beside the rest of the structure until it catches too.
Sprinklers and the like can help, creating a bubble of humidity around the house. I've got a couple of these ( https://www.waspwildfire.com/p... ), mounted on the ends of the roof peaks. They use less water than a regular sprinkler, but spray a good ways out, and moisten the immediate area.
One of my fire department colleagues is also a pilot fighting fires in the summer. He's seen the effects of a fire smart program first-hand, where a fire sweeps an area, and certain places come out more or less intact.