Did you verify that they will install the flexwatt? Or are they just hardwiring it with a plug and then putting it on the box? Putting flexwatt on the bottom is easy as from what I've seen, AP cages have "slots" that the flexwatt fits in. There is also a groove in the floor where a T-stat probe fits in. So really you could get flexwatt or THG cheaper from Reptile Basics and then it just sticks on with foil tape. But up to you I just prefer putting that kind of stuff in myself as im kind of OCD about any electrical and want to make sure I got it set up the way I want it. But grats and be sure to post pictures of it so I can see more AP cages to help me decide what to do in my previous post