Mounting Radiant Heat Panel in 10G Tank

I recently purchased a 40Watt Radiant Heat Panel from Reptile Basics (advised by Rich at Reptile Basics), for our Baby Pastel currently in a 10G Tank (With a screen top).
I just received the panel, and it is too large for the top of the tank (by about an inch). Has anyone been in a similar situation and has suggestions on the best way to mount this? I was thinking I could possibly somehow mount it to the side of the tank, but I am worried that it would heat up the glass too much for him to touch.
Any ideas?
Thanks,
Brandon

Why do you a heat panel? are you having problems with you ambient temps?

Yes. We can't keep up ambient temperatures. Temps in the house stay around 70° all year, and the tank is in our living room, so we don't want to heat the whole room.
This was advised as a better option to a heat light or CHE.
Thanks,
Brandon