Hi,
The Xavier NX developer kit has same design as Nano developer kit in USB so it is possible to hit bandwidth or stability issue when connecting to multiple cameras. Please check explanation in
connected more than two usb cameras problem on deepstream-app (Jetson Nano Dev Kit) - #12 by DaneLLL
For Realsense camera we would suggest connect to one camera for better stability. AGX Xavier developer kit has one type-A port and two type-C port, and is a propriate platform for 3x Realsense cameras.