I think concealing the safe is of most concern....but since a good safe should be bolted into a cement floor, that means its the garage or the basement doesn’t it?....and wouldn’t robbers go right to those areas?..
If your house is burning down and bullets explode guess what the fire department will not do?
If you don’t have a concrete surface you can use 3 1-2” lag bolts into wall studs and floor joists, preferably both, securing it in two directions. Mounting in a corner, with lag bolts to studs on rear and one side, plus floor joists is another option. Big plus is to hide safe behind false wall or other camouflage too.