I'd go with fixed mount on the
davits. It would also be easy to clean them and provide a bit of shelter to your
dinghy as well.
Usually as far aft and as high as possible is the best place.
Most mid size catamarans mount them either on a hard
bimini or over their davits.
Re, movable panels, I'm always amazed when I see a cruiser anchored, drifting around in circles in light
wind readjusting their
solar panels every few minutes. They look like slaves to their panels...
Imho, mounted flat, with more panel area is the best way.