Quote Originally Posted by MD_Pythons View Post
No, suction cup or not you should still sandwich it in between the UTH and the probe. That way your snake can't move, pee or spill water on the probe and cause the temperate to spike.

Totally agree with that, the best and safest method. When I first started, I used to put the suction cup inside the tank, on the UTH, with the hide right on top squeezing it down (so it would be on the edge of the hide), honestly never had issues with it that way. But the best/safest method is the one given already.