growing one or two colas per solo cup, please?

I’m thinking of doing 3 plants indoor in a 2×2. I don’t need a big yield but I’d like to grow perpetual so I can experience different flavour profiles.

breeding strains that can tolerate more water? If they did, those strains would be good for new growers, no?

One 60x120x180cm (2×4) or two 60x60x180cm tents?

My issue is space, not budget.