Thank you very much! I will have a look at those.
well I would pretty much configure everything and my friends would simply „use“ the servers by connecting to it via the games (Minecraft, Arma etc)
Have you tried using ZeroTier? I don‘t have much experience using Tailscale but have been using ZeroTier for two years now without any problems. Runs great on Synology
Looks promising. Thank you!