Your return pump will have to be located in your overflow box and pump to the sump above. You'll need two drain lines from your sump to setup a herbie style "return line" or overflow or whatever you want to call it so you don't get bubbles in the display. If the sump can just go a little higher than the DT so the water levels of each are at the same height you can avoid the need for the herbie style return.
If you do it right it'll work the same but in one way or other it'll kinda suck.
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