I have 3 holders mounted in my boat at strategic locations, so each seating position has one readily at hand. I bought them at Galyans. They are mounted with a couple of screws on a flat surface. There are two reason why I like them. One, they fold up when not in use, and they come with two holders. One for holding a regular can, and the second for holding a pop bottle or large cup. They were under $5 bucks a piece. One other advantage is that I mounted them in locations that when you are running down an open stretch, none of the “bump spill” will hit me the driver. The spray hits the passenger in the rear. Always fun to smack a big wave on the Croix with someone sitting there who is not ready for it.