It all depends on the type of heat you are using. For Under Tank Heat Pad (UTH) you put it outside on the bottom (between the heat pad and the bottom of the enclosure). Then get the temp of the inside bottom (underneath the substrate) right by adjusting the thermostat temp. settings and that works best by using an infrared thermometer on the glass or plastic bottom (inside).
For overhead lamp heat or ceramic heat emitter I put it just inside the hide door where I could see it and put the hide on top of the cord to hold it there. But that is just my idea I tried, seemed to work fine. That way I knew the snake wasn't laying on it or hadn't moved it, and I would get an average temp. of inside and outside the hide.
For a Radiant Heat Panel I have never used one so others will have to give input about that, and it will be interesting to hear what some with experience or knowledge have to say about the placement for probe.
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