If doing vert properly,you shouldn't turn your plants,at all...
When doing a donut with or without screens,one would want to veg vertical because when you veg vertical the plant kinda bends toward the light and branches will do the same.Hack off the back branches that won't get any/much light (and would steal energy from prime branches/budsites) or train them to the front of the plant where they will get more light.
Now when growing horizontal you may want to turn the plants on the outer edge of the footprint 1/4 turn a day for uniform secondary branch growth,ir even if you're growing under a vert parabolic hood (which isn't as good as bare bulb IMO...and most growers using parabolics are stil growing using a horizontal canopy rather than a vertical canopy.
If wanting to do 4'-6' + trees (actual trees) I think Heath Robinson had it right...Five bulbs total,one in each corner of a room with one in the center,hung vertical bare bulb,with four plants in the room,one on each wall (no need to turn plants but you could if you wanted to) so it would look like this:
(X= bulb,O= plant)
X O X
O X O
X O X