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.

Just want to add that at the moment AV1 is only beneficial for encoding to lower bitrate videos.
It’s still better to use x265 for high bitrate.

Just be aware that for a period of time the MX 500 had many reports of high failure rate. Not sure if it was due to a change of components or firmware.
Example post about it: https://www.reddit.com/r/sysadmin/comments/whr5ek/crucial_mx500_historically_good_recent_batches/
An article (In Portuguese).
And another post about it.

Personally I use Newmaxx’s site and spreadsheet which has more indepth information about the SSDs like their controllers and NAND type - https://borecraft.com/
You can also check their subreddit for some reviews and such.
That and some stats from Backblaze and general reviews.
And I use price trackers to make sure I’m getting a good price.

I don’t like going by specific brands, because they all have some less ideal models and some of them tend to change some of the components after a while.