Hi,
We have seen bandwidth issue on Jetson Nano devkits:
connected more than two usb cameras problem on deepstream-app (Jetson Nano Dev Kit) - #12 by DaneLLL
May hit bandwidth limitation if four cameras require > 5Gbps throughput.
A better solution is to use custom board with all type-A ports. On devkits, it should be fine to use C to A adapter.