Yes, you'd need two per side. It allows you to disconnect without losing too much water, only a few drops. Yes, they are big, but won't impede flow much.
I can see the reason for the wall in the center. It's to keep the bigger fans from cutting the flow off of the power supply. I had that problem with my case where my two large exhaust fans stopped all flow through my power supply. Ended up frying it.
I don't see the reason for having two fans like that, though. The shroud is no longer needed imo. It's just extra work if the rest of the res/fan area is sealed correctly.
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