I Have Done What Miles Has Suggested
If you go to the O'Day photo forum, under the title "Watts This", I have a photo of 2 framed collectors mounted on the bimini. To reinforce the Sunbrella I installed small brass grometts to allow the bolt to pass through. I drilled through the wall of the bimini frame. My solar frames have a channel that accepts the head of a SS bolt, and these pass down under the bimini and frame and have nylon nuts to secure them. You could mount your flexi panels to a piece of plywood, or Starboard type plastic to accomplish the same thing, but it defeats the purpose of the flexi panel. You might as well buy cheaper, solid frame solar panels.If I was mounting Uni solar panels on mine I would still drill through the bimini and frame but use plastic ties to attach them at the 4 corners. Be sure to replace these a couple of times each season as the UV weakens them.Don