I recommend installing the package from Plex.tv
Reasons:
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If you really want to add the Docker overlay, you still can, and remove it at any time
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There are changes coming in PMS which you’ll want to see.
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You won’t need to expose any HEVC licensing. PMS & your PlexPass already include that licensing.
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If you have PGS subtitles which need to be burned-in all the time, you’ll want a stronger CPU than the Synology. If you have text-based (SRT) then those are sent as a 3rd stream with no burn-in required.
Regarding a fresh setup, may I recommend you give a read here to help avoid some pitfalls.