I was considering this for 10x
http://www.ebay.ca/itm/20-Port-USB-HUB-Dual-USB2-0-Adapter-Industrial-Grade-Industrial-Class-Production/172852980142?ssPageName=STRK%3AMEBIDX%3AIT&var=471634643073&_trksid=p2060353.m1438.l2649

Has 20 ports, 90W power supply. Two could likely meet the power/space requirements.

Was also looking at this, but kind of pricey for what it is.
https://www.amazon.com/Anker-10-Port-Adapter-Including-Charging/dp/B005NGQWL2/ref=sr_1_2?ie=UTF8&qid=1505671531&sr=8-2&keywords=Anker+10+Port+60W+USB+3.0+Hub

Also looking into adding 5V power to an underpowered 2.0 hub as many in this thread have suggested. I've only done moderate research on it so far and am concerned about the power management and getting beyond design currents.