Pretty sure I can use that on my Switch. Says you need specific hardware though, might not work with the ethernet adapter I use. It doesn’t need internet access, your computer acts like a LAN client for the LAN play or something. Routes it over the internet, using your computer’s connection.
So no need to disable your blocking firewall rules on your router for the Switch. I may try it someday, probably not though, video games are boring.
Nice, you can run it on a Pi. I have one Pi I’m not using. Not sure that requires much processing power, so it might work on the security camera/Pi Hole Pi.