Hey guys. I already have heat tape and I know how to set it all up but I dont know much about the placement. Like is it ok to lay the heat tape on top of wood on the wood shelves, and is it ok to have the heat tape directly touching the bins on the top and touching the wood on the bottom? Also is it better using PVC or melamine. I have thermostats and such so u can control heat, I just worry about having a heat source directly on shelf material and directly on plastic of tubs