I would recommend against using foil tape as it is conductive and could cause electrical issues.
Rob, in my setup:
http://www.strictlyballs.ca/snakerack.htmI
I attach the probe directly to the heat tape. For one bin, I would not recommend taping the probe inside the bin, as it could come loose and cook your animal.
You also have the added worry about a short circuit if the probe gets wet, which would also affect the temperature read-out on your thermostat.