Did a google and found next to nothing. I'm thinking about the recent fire storms in California. Sparks and fire moves like a high wind snow storm - down, sideways and even up under anything above ground level.
First there is no such thing as fireproof - only near fireproof. Given the above conditions it would appear that the construction would need to be near air tight in order to keep out fire. Any vents or even roof tile would likely be major problems. Vents (no plastic) would need steel covers - to be manually closed prior to the event. Glass in windows or doors?? The roofing (even tiles with air gaps) would be a real problem.
Any suggestions or links (other than reinforced concrete boxes)?