You can play together by using a VPN service. A very nice service for that is ZeroTier:
1) register at ZeroTier.
2) create a network at ZeroTier (you will get a Network Id)
3) install the ZeroTier app on all clients (you will get a Node Id)
4) whitelist all Node Ids on your network
5) join all clients to the network by using the Network Id
Then you are able to play together via the LAN mode