You can put it in the cage just fine. Seal the connections on the flexwatt with silicone very well. Put it in the cage and tack it down (foil tape works great!). Then cover it with a piece of plexiglass, acrylic, glass, etc and seal that very well, so that the entire flexwatt is waterproof in case of a water spill or something. This way you don't fry your snake.