Trouble finding the best design for a low ceiling basement and drip feeding

I have been doing so much research but can't find anything for my needs... my rooms are going to be 13'x13' with the ceiling at 7' I planning on putting 24 in each room and running leds (3 rooms), I already know which lights I already want (advanced platinum series p900) and going to use coco, my problem is, how do I get this to work without the plants trying to go through the first floor lol

The answers I've been thinking that could work is...

Would switching from 5 gallon buckets to 3 gallon could have the same amount of yield? (to give it a lil more room to grow)

Have 4x8 tables, put 8 in each one, have it slanted a lil bit, so the water collects to one side, use a pump to pump it back into the resiviour then back to the plants

Have them in 3 gallon buckets, drill holes at the bottom, put that into a 5 gallon bucket, allow the water to drain into a 5 gallon buckets, cut a hole at the bottom and attach them all together with pvc, run it to a collection box, that pumps it to the resiviour then after that back to the plants

Or any other ideas anyone can help or think of, ive been stumped on trying to figure out how to do this for a while and any help from anyone would greatly help, thank you

With that much floor space it's really not problem. I suggest you do 4 tops and then break them when side shoots form lower on the plant. By breaking your 4 main tops the stems will have to repair and while this happens growth mostly halts. So the side shoots will likely be taller than them by the time they heal up again which is about a week. After the week has passed now break the larger side shoots and alternating every week that is needed to keep everything even. Anything more than 4 tops only works with certain strains, some strains don't do well at all with being manhandled weekly but most, including sensitive kush strains I grow, really respond well from this. I keep breaking tops all the way through flower because I like long veg times so even a plant with 4 tops would outgrow my room. (err not past mid flower I tie them down slightly at this point) You likely will need plant support even with all this bending because we are going for a lot of weight per plant here.

Uncle Ben has a thread on topping a plant to achieve 4 tops here on this forum. Basically you are keeping 4 branches that come from the sides, not tops at all. When the plant is 5 nodes tall you chop it just above the second node, each node has two branches. Those 4 branches you then pinch/crush the stem slight on the larger one to hurt the stem so while it heals the others catch up. You balance the size of the tops by damaging the stem of the largest one forcing it to have to heal before it can grow again, the others still grow in the interim.

Hope that made sense

similar to what @MeJuana said, you'll probably want to do some kind of training. HST/super-cropping will slow down the growth of the dominant branches. You can also LST, you'll still have monster branches but eventually you can start bonzai'ing them flat and bushy. Probably a good combo of both/either will do.

You have about.... 7 sqft per plant (2.7' x 2.7'). That's nuts. I'd maybe super-crop/break/mainline until you get 4 strong mains, then just LST it into a massive fucking bush.

No height issues here (not my pic):

go vertical so you can utilize the total height of the basement.