The trick is how to get them on the boat and in good place for deployment. Here's a photo of how I did mine, the forklift just dropped the block of the edge of the pier into the water with 20 mm rope looped around double to catch the weight and the anchor chain as a back up. The anchor winch then lifted the block back out the water and when we got out to the spot the anchor chain was removed and they lowered the block down with the rope wrapped around a cleat that was basically 3 heavy pipes welded to the deck and the rope wrapped in a clover leaf pattern but it gave very good control of descent, once on the bottom we just threw one end of the rope over board and pulled it free. You'll note from the photo that the mooring ropes and floats are on the cabin top which meant that the skipper had to climb over the side and attach, with the second weight we attached the ropes first.