Neat! Glad to hear
Yeah they’ve done a good job with their documentation.
I was tempted by it several times already to try some features I didn’t even consider using.

Yup.
Tailscale has some documentation about it, and also a bunch of examples (And apparently one specific to Immich).

Since you already got some replies, a bit of a different approach would be to set those services up using Docker and having Tailscale as a sidecar to each one of those.
You will then be able to access each one as a seperate device. immich.*.ts.net etc.

https://en.wikipedia.org/wiki/Standing_Together_(movement)

https://en.wikipedia.org/wiki/Women_Wage_Peace

https://en.wikipedia.org/w/index.php?title=Combatants_for_Peace

And in general I didn’t expect to see praise for a group that has “A Curse Upon the Jews” as part of their official slogan.