[sammyg2]

I know folks who live up in the high rent district hills who have full-house deluge systems piped with water from the pool and a generator to run it.
The sprinklers shoot water all over the outside of the house: on the roof, sides, under the eaves, to keep it cool in case of fire.

But even that probably wouldn't help if the whole neighborhood is going up.
Case in point:
I've seen houses where the drapes, furniture, carpet etc on the inside of the house ignite from radiant heat long before the outside ever catches.

If your neighbor's house is burning like a bonfire a go-zillion degrees, it wouldn't matter if your house were made of concrete.

In those extreme cases the only real prevention would be isolation. Building a house hundreds of feet away from anything else that could be flammable.
But unfortunately that is cost prohibitive when you start talking about multi-million dollar plots that are nearly on top of one another.