You can build out of concrete and use fire resistant materials like metal or tile for the roof and your house is nearly fireproof. These buildings would be realistically insurable in both California or Florida. They would cost more to build, not THAT much more though especially if land costs many millions, an extra 50k - 100k to build out of concrete is a very reasonable expense.
Flammable trees well away from a leaf free clean guttered (or no gutter) house are also no compromise requirements.
See: https://research.csiro.au/bushfire/ and https://www.csiro.au/en/work-with-us/services/testing-and-ce...
for the rabbit hole of Australian Bushfire housing certification and testing.
Burning Down the House: Trial by Fire CSIRO- https://www.youtube.com/watch?v=KBtawn7IAnI