Hey,
I'm running a Helium miner on LTE connection with Public ip, static lease and port forwarding and it works so far. But as the Rut 240 loses connection and takes hours to restart the connection even with ping, i tried to setup a vpn with static ip. Uploaded the ovpn file for static ip4 from my host (OVPN).
Hope this description helps to understand my setup.
Thx Patrick