I've seen some DIY racks that take measures to where the tubs don't slide over the heat tape, but is it that much of an issue? I plan on building another rack that uses belly heat (my current one uses back heat) but if I tape down all of the 4 sides with aluminum tape with the tubs sliding directly over the tape, would it be an issue over time? ill be using 1 foot sections of 12" THG heat tape for each level. Has anybody had issues over time because if tubs sliding over the tape?