Andy, certainly I would mount on the center arm, unless you have a method of keeping the arms evenly spaced, refardless of the wind and currents. If you mounted in the center, I expect they will rotate. Now if you mounted it along the center arm, but not at the end, perhaps you would get less pull down of the center/lead decoy? I have a set started in the garage, trying something new.... used hinges for the connections, and usiing real geese for the silos. Have not worked all the details, but I am going for very compact for use in my BBSB. Thinking I will do 3 v-boards, just to add some geese to the spread without the bult of 9 floaters!