If I’m not mistaken, synology has a torrenting “add-on” or extension (I can’t remember what they’re called for Synology) called DownloadStation but the one MAJOR caveat is that it does not support VPNs.

I will do more research and edit in any more that I find to be reputable

As long I could manage automatically the torrents traffic in the Synlogy Ill be happy.

I usually hay many power issues and shutdown and in the past moving to a secondary disk was a complete failure and I lost all my progress

You should be able to install a torrent client

If you want to set it up to do torrents and Plex, I haven't found a way to do that. You can do them both, but they will need to be done separately.