I like the idea of routing a groove but with the 1/2" diameter I'm afraid you'll affect the integrity of the floor.

I think you should just set it up and try it. Set the cages up on some cleats and see how well the heat transmits through.

If you don't like the performance then there are other options. My favorite is to cut a large rectangle out of the floor of the cage. Cover the rectangle with Sintra, linoleum, or FRP and then attach the heat cable to the underside of the floor. Makes the cage more durable and easy to clean as well as providing a safety air space for the heat source.

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