Hello. Hoping someone can help me. I use my SplitCam app on my PC for home "security cams". I know I need a "powered SUB hub" [Bus SUB hub handling only 2 of my 3 cams]. Confused on what type I need - how much wattage, what it's called, etc. The more I read about them the more confused I get. I don't want to get one that's just used for charging - I already have one of those.