That's a terrible idea for a couple of reasons.

#1 if the probe gets wet or somehow gets moved the heat tape is going to be fired up and get extremely hot, hot enough to kill a snake and fast.
#2 if anything happens to peel up the tape it ca nget stuck to his snakes scales and can either tear scales off or cover the scales in adhesive which is really bad for the animal.
All in all it's not a good idea at all