Thats what I'm thinking also. Just need to top them a couple of times in veg.
I'm just on the floor of the room but I have little tape saying I'm "within a 4*8" your milage may very.
I really like 12 plants tbh (I do run 3 lights over a 4*
but I'm able to offset every other row with one extra plant so I can do 15 max; pretty crowded probably not a 4*8. I also use 10 gallons tall which end up being 5-8 gallons depending on the plant and what it wants.
so 12 of you want to go hard, 8 for a "normal", maybe 1-4 with a scrog, 32-128 with a sog.
I wouldn't do a screen if you aren't harvesting all at once. I prefer to use binder clips to make them wide in the first 2 weeks of flower, defolate the 3rd tie them up on the 3rd to.