Been using Plex for years. Some stats:
1. NAS QNAP TS-453be, 32 TB of available storage. Currently have 13 TB used for videos, movies and TV shows.
2. A decent Celeron NAS will easily stream 7-10 blu rays transcoding to other resolutions at the same time original format encoded at 1080p H.264. My NAS has done 12 with no issues (Plex Pass a must to enable hardware encoding)
3. I have just over 800 movies, most Blu ray quality and over 2000 TV episodes using almost 13 TB of storage.
4. Plex work well for subtitles as long as they are not image formatted, use .srt and preferably for forced captions just burn in the text when you rip the video.
5. Handbrake is the best and free but can be hard to learn, there are several pay options that do well and easier, they sometimes can not rip certain encrypted formats, Handbrake with Reddox never fails!
6. Redfox is a must! just look it up, well worth the lifetime cost if you are into this stuff.
Reddox = redfox
I’ll check up on Redfox.