You can put it on a thermostat - it's very much like a heat mat.
If that's your rack then routing the shelves is the only way to get it to fit if using belly heat, what about using it for back or side hest instead? It looks like you'd have more room to fit it so could just stick it on.
I always use mats now, much easier than cable and each shelf can be individually controlled.
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Hi I have mats in there now the heat cable was going cheap n thought i mite try it,can I use the cable on sides for royals or does the heat have to come from under the tank?thankyou for your reply!