Hi Al,
Heat tape is pretty easy to install once you get get the gist of it. I wouldn't recommend installing one long piece of heat tape in the back except for hatchlings. Larger cages and snakes need more direct heat. I found out the hard way when I made my first large rack and ended up placing heat tape on each shelf.
Here's a PDF on how to install Flexwatt in a parallel configuration... the most common method on racks.
Good luck!
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