If you're just trying to keep them on the shorter side, topping and/or lst would work for that. Picking smaller/faster strains should help as well, but I'm not too experience on growing in a large bed like that.
I'm a big fan of SoG grows but can confirm humidity and mold can easily become an issue.
Here's 20+ in a 2.5'x5' tent from a few years back.
Looking at it now there's way too many and should've been defoliated hard along the way.
But SoG autos is definitely doable.