I do technical pieces to camera for training material and also live work at STEM shows (Raspberry Pi Jams, Arduino chats and other tech stuff), and have a three

I do technical pieces to camera for training material and also live work at STEM shows (Raspberry Pi Jams, Arduino chats and other tech stuff), and have a three monitor setup. Screen 2 will be running any apps I need to show (coding etc.) and screen 3 is at the back of the workbench, which has a downward facing camera so I can show me working on the boards and other electronics. Switching scenes from main cam to what's on screen 2 to the workbench is very handy, even without a dedicated key pad. The only hassle is that under Linux, OBS sometimes forgets the camera device designations on startup and I have to pull out the USB connections, re-plug and then go into both camera definitions and re-select the right cameras. I have device video and audio sink definitions behind he scenes so that the video and audio can be fed to virtual devices inside Zoom or Teams etc. Edit: Oh, and I have a client plugin which allows me to use my Android phone camera as a roving webcam to highlight things on the workbench such as a scope screen, power supply current reading etc. All works quite well.