Just for the two drains, the BM filter roller would need to be modified to accept two drains which requires drilling out the cover plate on the opposite side of the inlet to accept a bulkhead and elbow. This also requires re-routing at least one of the drains to the other side of the filter. Not as complicated as it sounds but not a basic install. You'll also need 8" from the side of the sump for the medium size unit to fit. Unless those are 7" socks, I don't think there would be enough room in your filter sock area anyway. Coral-vue makes a drop in filter roller but it gets pretty bad reviews.
Di-4 Drop-In Fleece Filter System
Months of Maintenance-Free Filtration! Klir Di-4 Filter Drop-In Fleece Filter System fits in most sumps with a 4" filter sock tray and will eliminate the need to replace filter socks. The 50-micron fleece roll will help eliminate free-floating particles and automatically advance when the fleece...www.bulkreefsupply.com
Ok I understand what to do. So the 3D printed blue thing up top is a bulkhead for a second drain? I have looked at the drop ins and agree not best reviews. Im thinking maybe I can put the roller mat in the first chamber of sump and skip the sock section. All I have is rock and pump for ats in that section with skimmer in next. Thanks for info this product is new to me anyway and seriously thinking of getting one.