Heating question

I have both probes on top of about 1" coconut bark substrate in both the hot and cool hides and so far seems to work well, never thought about putting them on the glass though.

I've been perplexed by this question, getting different answers from different sources. I understand why you would want it on top (to measure belly temp) but, then again what if they burrowed under the substrate? Could they be burned? That's why I heard to put it on the bottom (just in case they lay on top of it)