here mate im really not being funny but you cant fit 2 a/u in that space in dwc. smaller soil pots yes but theyre gonna get fuckin huge in that system. look at the size of mine, i couldnt even fit that 1 plant in there. if you get it even half right theyre gonna struggle so much for space that youll probably end up losing half of them to bud rot due to no air circulation in the middle of them.
id go with just the one or choose smaller strains. dwc is lethal for yields but there is such a thing as too much bush. only putting one plant in and having the full system on would make you an absolute beast and also be a piece of piss to control the ph. i ignored somebody telling me not to put 2 a/u in one res last time and ended up having to chop off 20+ colas and it broke my fuckin heart. lost about 4oz from the middle of the plants aswell. couldnt get into the bits i needed to defol, it was just a nightmare. i made that mistake man. please dont do the same.