You can do topping, clipping right above nodes to split the growth of nodes to multiple node sites (which in turn more bud sites)
Or you can Knuckle them, I think most people on here call it Fimming??? Idk we can it knuckling in MI.
You just slightly bend the new node growth and it will create a knuckle and force the plant to grow more like a bush!
Both of those techniques can be used in small spaces, you dont want them to grow too tall... You want them to grow bushy, you could also put up a trellis and weave the new growth through to create an open and even Canopy.
thats what i do with mine, I have a much bigger space then you but the concept remains the same!
Hope this helps, if you need more in depth instructions just lmk, i didnt want to make this msg too long!