I like the light weight aspect of them and that they don't stick up. Not keen on what the Wynns did with the wiring though.
I wonder if the cupping that AM is experiencing is from heat expansion? If you tape something down too much, then where does the material expand to? I think there may be a better technique to mounting them.
I would think that they could be taped down in the same orientation as the panels on the van pic above. Leave the grooves in the van roof open so water passes underneath them. That would also leave some room for expansion. Don't think they need 100% sealant under them, or along the edges.