Question about Synology DS216play

Better is a Plex Shield as a Plex server with a mount from the NAS. It works very well for me - even with transcoding for multiple streams.

I have been using Plex on my QNAP 670 Pro for a few months and it works perfectly. The processor is also only minimally utilised. Not really a problem. The processor performance should be enough, as long as you don't have many other resource-hungry components running.