I put in my 2 cent worth. Being hunting waterfowls for 46 years. Through my experience I like to set my decoys in 2 groups. Right side groups is about 30-50 feet apart from left groups. You want the ducks to land want in big opening. Don't placed the (group)decoys to close together spread them out a least 5-10 feet part. Bunching them up together means the ducks are nervous and ready to take flight. I like to set my robo ducks about 50 feet away from the decoys. I used one tall pole and one short pole.

I notice on sunny days I get way more mallards coming in for some reason. Windy days are great for all kinds of ducks. When by myself I just target greenhead.