Yes- Flex-watt is also placed OUTSIDE, underneath the tank. And the probe is sandwiched between the glass & the UTH, then the t-stat adjusted when the INSIDE temp. is correct as measured directly over the bare glass, without substrate (as could happen when snakes get pushy & burrow down).
That product from reptile-basics is not "Flex-watt" brand but is made similar- I cannot speak for that which I've never tried. I think you can get the brand Flex-watt from "The Bean Farm" (online), if you wish. But do be advised (at least in my experience- & mine is all old "original" Flex-watt) that Flex-watt doesn't get quite as hot as some other UTH -like the one you had that tried a meltdown.
The kinds of snakes I keep (not BPs currently) do not require as much heat as BPs do either, so I prefer Flex-watt. I've had nothing but long-term (decades!) of safe operation using it. Safety when using any UTH depends on controlling it correctly- with a t-stat (or rheostat, where applicable). That generally prevents problems, as does correct installation- leaving the small air-gap as directed, & don't let a tank or enclosure sit directly on a wire- as over time, that can cause a failure too. And don't over-insulate OVER any UTH with deep substrate.
Yeah, I wondered why you stopped talking to us? Welcome back...
OK,… I have my temperature probe in between the glass and my heating pad on the outside of the tank. My heat mat thermostat is hooked up as well.
Do you think the temperature probe wiring is safe with the heating mat?