You don't have to really top at all in SCROG if you don't want to. Just keep tucking the growing tips under the net as they get long enough, until the net is full. Then flip to flower. Recommend a sativa dominant strain for SCROG as they stretch more. I have had issues trying to SCROG Indica dominant strains due to short distance between nodes.
One of my tester tents is a 2x2, running 2 324qb led's turned down to 125w total during bloom and 1 120qb for veg. Usually I run 9 plants in 1 gallon pots untopped and hit between 120-150grams total but I'm not trying for yield just looking through genetics to run in larger rooms.
You run 9 plants from seeds? How many veg?
how to maximize yield in 2'x2' grow tent?
1 plants? 2 plants? 4 small plants?
Scrog? LST? FIM? Topping?
Ok, but I prefer to use only one qb288, I think to go with 2 plants in 3gal pot or 4 plants in 2gal pot, with some LST, which is best ?
Only reason im using 2 boards turned down is i had them sitting around not being used. 1 qb288 will work great depending on spectrum. What spectrum is yours? Do you plan on using that board for veg and bloom?
If i had to pick out of the options you listed id do 4 plants in 2 gal pots. That way plants dont get quite as tall and have more of a variety to smoke when done.