They will move with the wind, but I like Earls idea about the stakes on each side.You can get marking flags for landscaping for that, they are a thin strong wire that you rip off the flag and hit them with a little paint and there good.
And when I got tired of chasing turkeys the decoys(withe the great stuff inside) became targets . put the stake in the ground and the turkey on it and shoot away. I shoot a 70# hill and it stops the arrow and spins around on the stake.Kids love it.