Need at least two USB controllers, what are the options?

Hi,

In my application, I collect data from two (Kinect) cameras simultaneously and each camera requires a dedicated USB controller for sufficient bandwith. Most Dell laptops nowadays come with all USB ports connected to the same controller which means that the bandwidth is insufficient to run the cameras at the same time . In the technical specifications of laptops, the number of USB ports are given but never how many available controllers. Here my questions:

1. How can I get information about which Dell laptop models come with more than one controller available for the USB ports?

2. Are the USB ports on a Dell docking station always on a separate controller from the laptop unit?

Thanks,

Fredrik