i'd recommend NOT standing them up vertically. they'll get in the way.
the pic efka posted is neat but wont work with 8'+ muskie rods
when we fish muskie, there can be about 10-12, maybe even more rods on board. one guy has his laid out with the butts on the trolling motor platform, reels hanging over the casting deck and the tips pointing out past the windshield. they aren't going anywhere unless it's really rough. then just pull them off the trolling motor platform. the other guy has his on top of the rod lockers tips hanging off the transom. seems to work well enough for us and sometime we're like a tackle shop on water.