Nothing is fireproof. You can make it highly resistant, but if your landscaping looks like the entrance to the bat cave or a structure close to the house burns there’s a fair chance it will burn.
Everything in my shipping container 30 feet from the burning structure burned my propane tanks 75 feet from a burning structure cooked off.
Perhaps I should have used the term you supply: Highly resistant.
Medieval castles were constructed to be highly resistant.
If they burned, it was because the fire came from the inside.
To make a structure more fire resistant you have to get rid of soffit vents.
The heat from the outside will make the wooden materials inside the soffit/fascia/rafter cavity combust.
This has happened in prior fires even when the exterior materials are all stucco/metal/masonry.
The other factor is removing all shrubs, ornamental and large trees away from the building.
In the Paradise, CA fire almost all the houses had multiple huge trees within 10-15 feet of the houses. If the 100’ high tree hanging over your house ignites, most likely your house is going to burn too.