PVC cage question (heating)

I bought a pvc cage today, haven’t set it up yet, but I am confused with the heating

so the heat tape/panel goes on the bottom of the cage, I know that (my bby is in a tank rn, and the heatmat is underneath) however does the pvc need to be slightly elevated for airflow, to minimize the risk of fires? (The heatmat in his current tank came with little rubber “feet” to put under the four corners of the cage to keep it from being directly on the table)
if so how do I elevate the pvc? Should I reuse the rubber “feet”?

A slight gap won’t hurt but isn’t completely necessary provided you’re using a thermostat to regulate the heating element. You are using a thermostat, correct?
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When I ran AP cages the recomendation was CHE as usually heat tape won't makeuch of a difference underneath them. Racks the tape goes in the rack and tub sits on top of it.

I was having the same issue converting to birch setup ended up setting a CHE set to 85 ambient temps hot side and just disregarded belly heat, so far so good. Unfortunately since 99% of setups are using belly heat for BP's it's difficult to get good info about CHE or RHP setups

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Sometimes the cheaper chipwood finishes can be damaged by constant low heat. If that's not an issue for you, you probably don't have to worry about the feet. It will also help redirect the heat upwards into the tub instead of spreading out under the container.

I keep my two ball pythons in animal plastics pvc enclosures. I used a few packs of furniture pads to elevate them slightly. You don’t need much space in my experience. Be aware that you’ll probably need to run your thermostat a little higher to get the heat through the pvc. Having said that, make sure you regularly check the hot spot in the enclosure with a heat gun.