I didn't know better, and stuck the UTH on first, then realized the probe had to be on it too. So I ended up taping the probe on, like this:
One good thing is that the heat pad sits flat against the glass.
I think covering the sides of the glass tank will help the snake feel enclosed and safe. For $10-15 or less you can get background graphic vinyl sheet to provide a more natural look.
http://www.petsmart.com/reptile/habi...pfm%3Dcategory
My local pet shop has various rolls of this stuff that they cut in whatever length you want.