The best protection against fire is to put the safe in the basement. Fires typically burn up, they rarely burn down.
With regard to safe size - if you can't fit a large (wide), heavy safe where you want it, you may be relegated to buying two safes, which could prove to be convenient anyway.
Separate SAFE ROOM that you can use for your family and valuables. 10' x 12' room with 6" reinforced concrete walls and ceiling separate filtered air and coms. There are some LRH members that have made them and posted pics in the past. Don't have to worry about 20minute fire rated.What is your gun safe of choice? Favorite brands? Size?
I've currently got a fortress gun safe and it works great, but am soon gonna need an upgrade as it's just not big enough…