I have currently got 9 QL fans, CPU, GPU & pump res connected in my 680x and it works a treat.
I have 5 fans on one hub, 4 fans on another hub- both connected by USB to Com Pro. I then have the gpu to cpu to pump/res daisychained, connected to hub, then connected to RGB1 on Com Pro, leaving me further RGB lane to add future strips if needed.
There is a lot of wiring but with a bit of time and patience it can be done tidily enough!
Will try to add pictures later as I have also removed the glass front panel from the case and getting massive reductions in heat which is good. Have ordered a piece of tempered glass that I can add or remove when needed