I am wondering about the proper way to heat a stack of cages, like boaphile type cages.

If you put heat tape/heat mats on the bottoms of the cages, and then stack the cages, won't the cages get too hot? They'll be getting heat from top and bottom then wouldn't they?

Like if I have two PVCX cages and put one on top of the other, won't the bottom cage get too hot from the heat at the bottom and then heat from the bottom of the one on top?