how to make put additional USB 4 host controllers to pc

[mam mamm]

helloI need to connect several cameras to the pc in order to use them in application.the API requires:""Note: “Be sure that each camera is connected to different USB controller.” If camera is connected to the USB hub/controller with other device (e.g. camera) - the acquisition will not be stable.""device list in control panel shows one USB-root, only .Where to find 4 different USB controllers (not hubs as further explained) and attach them to PC?How do we attach them, when found, to be connected to the root hub since we have 2 usb3 ports on the PC?Not using desk top

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