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I do it all the time. The server machine needs a static IP address. Or you can sign up for noip.com. Port forwarding needs to be set up on the main router.
If there is a reliable internet connection on the iPads you should be able to connect to a solution hosted on a server without problems using FM Go.
FM Go supports, as far as I remember, WiFi, LAN and 4G.
fm go supports any network supported by the device.