I do not recommend them at all, the heat is VERY uneven throughout the cable, so one shelf might be at the right temp while the rest can be way above or below and I am not talking about a small differential either that is acceptable with other heat sources.
I used to have racks (vision racks) that were using this type of heat and I would never use that again.
The way I had the probe was zip tied and than I had foil tape wrapping the cable and the probe.
In addition keeping the lids on a rack will get old fast so doing it with a plastic shelf unit like this https://ball-pythons.net/forums/show...r-s-Snake-Rack would make your life easier and allow you to use heat tape as well, they have different depth when it comes to shelves so one for bigger tubs than those used in this DIY can be done as well.
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