With temps that warm, I'd save yourself a few pennies off the electrical bill and turn down the Herpstat. Hot spots over 90° are basically useless and can actually increase the rate at which females produce slugs rather than viable eggs. I can't remember the exact figure or where I read/heard it, but the tipping point seemed to be around a body temperature in the mid-80s for decreased fertility. Also, in BPs in general, prolonged exposure to temps over 95° are also said to have impacts on their neurological function.
About the substrate - you certainly could put it over the hot spot. There's no harm in doing so at all. If they want to move it out of the way and lay directly on the glass, they will be able to.
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