Probes being pulled by anything snake or cat doesn't matter it is bad. I also suggest a failsafe back up system. the interior placement has been recommended by Dion the designer of herpstat for ages. I'd guess it is not that new. if you use an exterior placement why use a thermostat? If the temps change dramatically up and down why not just use a rheostat and change it daily?
If I cannot pull the probe loose with out a putty knife how can the snake? Probes MUST be secure no matter the placement. If it gets pulled by a cat or child or owner or snake the result can be the same. In any placement you should be able to pull the cord to breaking the wires before the end moves. A fail safe IMO is not optional I always use fail safes and the placement of the second probe is between the heat and cage so the chances of pulling both in separate locations is very very low lower IMO than both probes together, where the cords might also be together and get pulled together. A sharp tug on the probe should result in broken probe wires and an alarm due to probe failure no matter where it is.
I use all three methods interior, over and under exterior placements and The most accuracy comes from the interior the under (channeled) is next and between is the worst for accuracy. i change temps on the exterior placed probes once a week on average in the winter.
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