use the hard plastic decoys, tie some fishing line to them, with the line still on the rod and reel. Cast the decoy over the line and reel decoy tight to line, and use the weight of the rod and reel to keep the decoy tight to the line. People may be laughing at you when you come into the field with your fishing rods rigged up with decoys, but you will get the last laugh. one on the line is good, but two is awesome.
There is no such thing as a cripple being too close!!! If so, you might never see it again. I'm not going to take that chance!!!