on my boat, the wall in the head is the only flat space available thats big enough for storing a flat object...
what a previous Owner did was place the leaf in the corner, and built 2 "L" shaped chocks (like oversized mirror clips) at the bottom for the panel to set in so it couldnt kick out, and then installed a stopper block so it couldnt slide sideways when heeled.... then fashioned another "L" shaped block at the top that swiveled on its mounting screw...
then place the leaf in the lower brackets, push it flat to the wall and turn the top chock/latch to secure it...
this is a quick and easy way to create secure storage for anything that is flat on one side, and any flat area that is large enough and available would work for this... even overhead...