I am running 6 U1's on a Anker 9 port USB 3.0 hub. No issues what so ever with power. I would test to see if I could run more on it, but only have 6 U1's.
I was looking at that one, and saw the power supply is the same as the one I bought, but mine has an extra port, so I went with it instead. I guess we'll see if it's any good