Flexible panels have a short life when installed on a flexible surface. The small wires inside the panel will break when subjected to repeated flexing. Flexible panels will work on a curved surface if the surface is hard, like the top of a hard dodger or cabin top.
A rigid panel on the arch will be your best option.
Photos of your arch will allow us to make suggestions on how to mount the panels.
Thank you for replying. I’ve had the panels for about 6 years and there still an output of 13.5. I’ve thought of attaching a frame to the davits but they are pretty low and I can see hitting my head a time or two. And, I would probably need to get solid panels.