Hi @MarcusLim,
You can use different combination of interfaces for your camera.
eg Module like verdin iMX8MP is having 2 X quad lane MIPI CSI interface which can handle 2 CSI camera and USB 3.1 which can handle multiple cameras based on your camera resolution. Additionally you can use IP based cameras as well.
You may also consider connection more than two cameras to MIPI CSI interface by using some kind of bridge/MUX.
Read below
4 Cameras with CSI interface
Virtual CSI ports