I have the Juniors and two of those will crowd a normal 2x4 tent - one of the original Earthbox and a moderate size plant is all I would put into a 2x4 tent - two juniors would be ok if you grow smaller strains but if White Crack, tent would have too much vegetation in it and you would have environmental issues ..... less is more, trust me on that, I know I tried ......
As for rootmakers they don’t come without issues such as getting baby plant out of the pot, I have to cuT my rootmakers to get out without shocking so be prepared to waste the planter when you use ...... direct start is another option and with small tent you could probably pull off, just make sure temp inside is minimum 80 degrees even 85 better and humidity around 70% and do direct plant - otherwise rootmaker is a great option but and I repeat, I have to cut pot to get out without shock and I’ve got 42 years transplant experience with tons of pots and only option for me was to cut pot or shock plant and that never is a good idea.
Peace,
MOB
PS - I give my transplants water with Thrive vitamin B1 in the water which will help heal the roots should any minor damage occur.