Put all of your enclosures on the ground away from anything that may fall on top of them. You dont want the snakes to fall off a shelf or something, or to get crushed from falling debris, also place them on top of a rug or carpet on the floor so the heat is not transmitted directly into the floor, the carpeting or rug will insulate the tanks from heat loss.

Maybe place them under a table to shield them from falling junk...