Hi,
The cameras look to be USB2 cameras. It is possible to hit bandwidth constraint. Please check the relevant topic:
connected more than two usb cameras problem on deepstream-app (Jetson Nano Dev Kit) - #12 by DaneLLL
The USB design is same for Jetson Nano and Xavier NX developer kits, that there is embedded USB bub connecting to one USB3 roothub. For having 5Gbps bandwidth, we would suggest use USB3 cameras.