Internet Exchange

Highly recommended one, no need of multihop, and convenient to send routes via Route Server
View our Possible IX

Physical connection

Maybe but we are not tempting to pay direct fiber fee.
View our available DCs

Vlan provided by VM suppliers

Some suppliers like IFog can do this, providing Vlan between VMs.

Tunnel or VPN

Less recommended, quality depends on public internet.
But also welcomed, GRE/SIT/VxLan or Openvpn/wireguard/tinyfecVPN