Jody-
At the A Worlds we had 100 boats and two ramps to the water! Multiple people planted small Danforth anchors or cinder blocks with floats on them out in the water so they could launch "before the rush" and bring the boat up "after the rush"- It was very helpful. IMO small mushroom anchors- unless well buried in the sand/dirt/rocks will not reliable hold our boats in much wave or wind, especially with the sails up. So I would use a more substantial anchor-

Kirt