It is quite a debate I have been doing both. I have some inside and some outside. Tubs I'd go outside as the tub wall is so light the differential is quite small. On heavy containers (PVCx enclosures or glass) I'd go inside. Hot glue works great it melts at 300-400ºF so 90 is not even close to melting temps it certainly doesn't melt in your hand. Heavy enclosures mean much higher deferential temps and as the ambient temps lift during the day so does the hot spot and the t-stat due to the weight will not shut it down. I have never had a snake laying on the probe change the interior temp more than 1 degree same goes for pee I have yet had a snake poo on the probe.
I believe in back up systems 100% I have one one every probe a second emergency shut down. In the past month I have seen at least one post about a probe pulled loose from a rack and the snakes burnt and deaths occurring. With a back up if the snake does anything to the probe the back up will kick in.
Interior probes need to be secure (well so do exterior ones too) it is much more accurate with heavy walled enclosures that act as an insulator. It is less likely to pull an interior probe than an exterior one as it is passing through a small hole and is secured as apposed to just secured.
Remember do not use aluminium tape to tape probes down it conducts well and can increase the inaccuracy. Dion of herpstat recommends interior placement.
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