I use RHP's in my Leo tanks, I have attached them to the screen tops. I poked tiny holes in the screen and mounted them on the underside, using a lot of washers in case the screen tears! I poked a hole for the cord too.
So, from top to bottom, they have a sheet of plexiglass, screen top and then the RHP. I've had no problems, works really well.
I will take a pic later if that will help...lol.

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