Its trial and error I am afraid. All of my onvoard USB devices are passed through and yours looks to be the same as mine, each USB 2.0 controller has 3 USB hubs. I pass through the USB 2.0 controller and 3 of the hubs to each VM using USB's. If you are running out of PCI passthrough slots to the VM you can pass through less, as you say each hub is 2 ports but I have found you must pass through the 2.0 addapter to get it running at 2.0 speeds.
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