Usually somewhere around 12" or so. I use the net to provide support so I set it as high as possible. The other thing for me is the higher I set it the easier it is to water and maintain the plants. Others use a net as a training device and will weave or tie the growth points in the net. A second net, set above the first, will often be used in the case.
I used clones for the SOG because I had them. And, once I changed the lighting to 12/12 they would be ready to flower and be a quick grow. You can use seeds. They need to veg long enough to flower but you save time by flipping earlier. You can check out @Rap Sea of Green in cups
This SOG was from seed and motivated me to give the method a try.
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