I've been using RBI Heat Panels on my Boamaster cages. I had never used them before, so I asked Mark where he recommends the probe be placed, and he said that he usually puts it under the newspaper below the panel.

It has been working ok, but sometimes the probe gets knocked out of position by the snake living in the cage. I use 'Gorilla Tape' to secure it between cleanings, but since the boas are in the 25 lb. range, it doesn't always hold.

I just ordered four more Boamasters and two more Visions, and this time, I'll be attaching the probe directly to the panel with silicone and using a temp gun to fine-tune the basking area.