I usually do below on tubs, but only when the cage is on something solid and fairly insulating. If I ever put a tub on a plastic rack with holes in the shelves, I just carve a slot into some 1/2" insulation foam and set the tub/mat on top of the foam. The insulating material beneath helps keep heat and measurements steady in my experience.
Only times I have probes above a heat source is in my T8s where it has a slot carved into the PVC above where the heat tape goes. No bubble with herpstat probes, so I use those.
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