Cup holders should be installed on the front of the strut (part that holds pontoons together). Choose a location that is convenient & comfortable while you are on the unit.
NOTE: Make sure to place the "U" in the upright position.
Rod holders should also be installed on the struts. Read directions that come with the item for details on how to place the base of the holder. The rod holder can be removed from the base when not in use by rotating it. Care should be exercised when installing so that the holder cannot be easily "knocked off" the base by identifying the direction of rotation for removal.