for the real deal commercial grade solution try fish paper.Cheap,high breakdown voltage,easier to use than most solutions and in fact is probably in a lot of you consumer gear and you don't even know it
sent you to my secure page there
www.tubesandmore.com and in the search type in "fish paper then click for the separate page of details
Well if you use the Alps BLue velvet pot or even one of the cheaper ones
you can use them to secure the panel. They provide a real good grip. IMHO there is no need to use extra mounting hardware unless you're not board mounting the pot.