Mount the grill already!
I've had my propane grill mounted to the stern rail, directlly over the rail
for 6 years of cruising.
2 circumnavigators that just recentlly returned to the marina have theirs there
also. It's not like it's inside the cabin.
I can't imagine having to mount and unmount the grill every time we wanted to
grill something.
Mount it on the rail, and enjoy it!