You mean the Tailscale part? If so, it is easy. Just install Tailscale on your VM and allow communication between the VM and your Proxmox Tailscale node with the ACL page on your Tailscale account. Make the Proxmox Tailscale node a subnet router or install Tailscale on the VM/Docker of each service.
Nice. Which tutorial did you follow? I’ve seen a few on the web.