Bazarr seems to be a subtitle downloader, and Prowlarr an “Index Manager” (though I’m unsure what that means).

Means you can say "Here's my API key for these private trackers" in one spot instead of 8. "Indexer Manager" is probably a better description.

Ooooooh.

Prowlarr is also important if you do multiple *arr. Sonarr, Radarr, Readarr. instead of configuring your indexers (multiple) in multiple places? You point the searches at Prowlarr and then keep it updated.

I personally run a fairly modified version HTPC on a QNAP (was synology but upgraded earlier this year - better base board + dedicated graphics card)

https://github.com/sebgl/htpc-download-box