For that, I'm not sure if a DWC is ideal.
It's amazing for bigger plants, because they need so much root space.

I have set one big vertical plant into the center, and 4 smaller growing ones around.
E.g. hemp in the middle, and parsley, basil, mint, etc., to the edges. Like this:

If you only grow leafy greens, then screw all the other systems and grow full Kratky with reused containers like wine bottles. Especially with a small adapter on top for easier refilling it's lovely, eco friendly, cheap and simple.