I hope you mean 12 inch???
You can do it a couple ways but an oil filled heater might be more effective.
How handy are you?
If you are set on dual zoning the racks I have an idea.......
You really don't want your tubs rubbing on the heat tape so putting a second source at the front of the rack isn't easy.
Is it a home made or bought rack?
You could mount the tape at the front of the rack under the shelf/over the tub....... Just getting it up there without having tape accessible to the open tub below it.
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