[Solved: RTFM. Duh! :) https://tailscale.com/docs/integrations/proxmox ]
Having a bit of a conundrum around running @tailscale on #proxmox
Because tailscale modifies /etc/resolv.conf so you get their "Magic DNS", when LXC containers are created, the default behavior is to inherit the host's DNS.
You can run Tailscale inside an LXC container if you pass through the /net/tun device, but that's not going to help things like the ProxMox VE Helper Scripts @technotim recommded do their thing.
Hrrmph :)
Tailscale
Tailscale on a Proxmox host · Tailscale DocsSee how to optimally configure Proxmox for use with Tailscale.