Interfacing more than 4 cameras to Jetson Nano

I would like to interface multiple cameras (6-12 cameras) to the Jetson Nano working synchronously. Since virtual channels are not an option, only 4 cameras are possible via CSI interface.
One possible method that I could think of was to use 4 via CSI and more via USB. However, I saw a few threads that claimed to have USB bandwidth issues when connecting more than 1 camera.
Is there any way I can avoid this issue?
Are there any other ways to go about doing this?

Should be fine for low resolution and low frame rate usb camera. Otherwise you may need to use TX1

Could you specify the resolution and frame rate that can be used?
How many of these USB cameras can I connect?

Two USB should be fine with Nano, But I didn’t verify the resolution. For the higher resolution it could have frame drop issue.