The Thermometer Probe goes where the snake sleeps on the floor above the UTH. I use Silicone not Hot Glue. Hot glue seems to crack and break off, Silicone is Rubber, flexes and doesnt break... And no 90 degree heat does nothing to Silicone or Glue.
Your Thermistat (TStat) goes outside the tank under the UTH itself. Have you seen the Thread on setting up a glass enclosure? Its a awsome thread.
https://ball-pythons.net/forums/show...-With-Pictures!