The Solara Power M series are thin, semi flexible solar panels that come embedded with an aluminum
backing panel, to diffuse some of the heat. So they've already taken abating heat build up to insure performance.
These are installed on many catamarans, including Lagoons, usually 10 or 12 at a time. I have never heard of an over-heat situation, but, then again, never say never!
Bear in mind, these are not your standard, super thin, flexible panel where a piece of twinwall polycarbonate can be a good addition to get air flow under the panel, like the Solbian panels that Bruce Schwab and Coastal Climate Control sell. Most often these type of panels are sewn or velcro to a bimini
which in itself provides the ventilation.
ColdEh's idea of using velcro on a hard surface is good, as long as his reference is for these heavier panels (about 7 lbs) as verses the very flexible panels (about 3 lbs) noted above. He says he hasn't lost one yet, ditto above's "never".