My Animal Plastics rack has it woven through the rack. It simply goes across one shelf and then in a slit between the side and the shelf. It goes along the wall and then across the next shelf. On the other side it again goes in a slit and to the next shelf. Kinda a zig zag pattern going from shelf to shelf and along the walls. The AP has a groove the take fits in to sit more flush. I would check theirs out for ideas.

I liked it being this way because you have one power source, one TStat, and one probe for the entire rack. I have enough going on in my snake room and didn't need more plugs and TStats.