You can put the probe on the outside of the tank between the under tank heater and the bottom, just tape it to the bottom of the tank. I also put the probe in the tank taped to the bottom but it can get wet, not good. And if you switch to a rodent tank they will chew the probe, happened to me before I caught it. Once the probe gets to the set temp it turns off the heater until it cools to a certain temp. If the probe is not in the hot spot it won't get to temp and your heater will run on high.
Tape in your snake cage is a BIG NO GO. Google it. Not pretty.
KMG
0.1 BP 1.1 Blood Python 1.0 Brazilian Rainbow Boa 1.0 Aru Green Tree Python
0.1 Emerald Tree Boa 0.1 Dumeril Boa 0.1 Carpet Python 0.1 Central American Boa
0.1 Brooks Kingsnake 0.1 Speckled Kingsnake 1.0 Western Hognose
0.1 Blonde Madagascar Hognose 1.0 Columbian Boa