Few stupid questions about full body VR!

>1.
 What advanced settings program should I use? 
(OVR Advanced? Or something else?)

>2. 
Getting 3 trackers, don't have enough USB ports.
Should I get a run of the mill USB hub to plug the little node things into? 
Or should I get a 'PCIe to USB' card and plug each of their own individual dongles/cradles into that? 

>3.
Any tips or advice? 
Using the Index, have 3 lighthouses up, will have 3 trackers soon as well as battery straps from Rebuff Reality
What can I do to ensure I don't have any interruptions or signal interference? 
Should I have anything else to complete the immersion?