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I run it currently to connect between two machines (and sometimes phone) but I didn't really know what else it could do. I had a quick read and it seems you can create a site to site VPN type deal but it requires running computers at both ends (acting as "subnet routers") which seems like a waste of effort if I could just get two cheapo routers joined up.
https://tailscale.com/kb/1120/subnet-site-to-site
https://tailscale.com/kb/1019/subnetsvs.
https://forum.gl-inet.com/t/building-a-site-2-site-network-manually-using-two-gl-inet-routers/18294
Tailscale?