First off, forget about sticking anything inside the cage. Snakes and tape do NOT get along.Originally Posted by SnakeLos
If you're talking about the Accurite-type of thermometer, just place it standing up with the little flip-out stand that it comes with and place the probe under the warm side hide. The unit is best on the floor of the cage because that's where your snake will be spending all of its time. Also, the humidity is measured with the actual unit, and not the probe.
I think I answered all of your questions. Good luck, and can't wait to see the pics!