ok i'm looking into building my own rack and for heating i'm obviously going to be using flexwatt but my main question is...

has anyone implemented a way of applying the flexwatt (belly heat) to their rack as to where it can be used over time and time again and not worry about the sliding of the tubs damaging the flexwatt. i know these commercial companies recess their flexwatt into the rack but i don't feel as though i have the tools nor the skills to do so. any suggestions?