Some manufacturers do. CADE has their return on one side and the RO reservoir on the other.Couldn't you achieve the same by making the overflow like the AIO style, so that the back wall of the display doesn't have a little tall box going up the wall? At the very least you'd get a bit of space back into the display, no?
Yes, it's so you can push it flush/flat against the wall. It's also so that the plumbing extends through the stand and not behind it (easier for maintenance and to provide some protection for the plumbing).Is there a reason why most plug n play tank + sump manufactures make their overflow boxes inside the display? I don't like the look of a rectangle box in the middle of the display- does that make sense?