I has set up a version like this on a R-Pi. I only had to DLinks but one was plugged into the other and I had 11 BEs working fine. The other USB on the R-Pi was empty. I also had a fan in one of the hubs and the R-Pi was powered by its own AC adapter. Worked fine for over 6 weeks, then I sold it. When I figure out how to add a pic I will upload it. Got it. So adding 6 more DLinks should not be a problem. You need about a 4 amp AC adapter per 6 BEs. My DLinks came with a 4 amp AC adapter. You also some cooling, like small usb fan.