SOG if you mean flowering from clone in a water farm I think thats a bad idea.
The feeder rings are way to large, the roots will need to be hand fed because they are so small. Besides that a SOG is done with a hell of a lot more then eight plants.
If you mean SCROG a screen of green. Well I think thats a great idea. A screen will increase your yield keeping the buds at the same height. Besides then you can take advantage of the best part of a waterfarm. SIZE
Put a net about a foot above them and curl it up on the sides to about 3 feet.
Veg for two to three months and keep tyeing them down. When the net looks about 75% full then flip to 12/12, train for another two weeks and let them go!
You may want to look at my water farm journal. I figured out a way to make it more efficient. I wish I had a acreen on these