Method fine for places with trees that have an abundance of limbs, or for hanging on cross boards with stumps. But, have you ever gone mobile with your yo-yo's? All you need is PVC. You make a rectangular base, with a T-joint coming up from the middle of one side. Place another PVC piece in that opening, angling up at about 45 degrees. Put a cap with a circle hook on the top end of it. Then, tie to the yo-yo's limb line. It can be pretty effective in clear water, or when fish are not relating to specific cover - like tightly to the trees. The yo-yo hangs down in the middle. It's very similar to jugging for cats. Thanks go out to a Sherwood buddy who once showed me this move on Faulkner Lake during a snowstorm.
I saw a guy doing that on Conway last year, but his was about 4'x8' and had a BUNCH of yo-yos on it with a couple of pieces of foam tied on to help it stay afloat. Not a bad idea, and probably cheaper to build than a bunch of small ones.