You do not need to buy different camera models - XIMEA provides both of these options in one USB 3.0 camera and you will find a simple way how to switch here.
Being USB 3.0 compliant, XIMEA cameras support backward compatibility to USB 2.0 and here is more details about how to utilize this.
If instead of PC desktop you prefer Laptop, XIMEA cameras are ready for it and here are tips on how to use USB3 cameras specifically with your Notebook.
There are many applications in Machine Vision or 3D scanning which require multiple cameras for an application and here is useful information about the setup possibilities.
You do not need to stick with the notion that USB3 covers only 3-5m distance. Look through the various options to choose from here.