Looks like a good setup to me. PMS typically runs very well on Synology hardware/software. A couple of things to note:
- don’t plan on transcoding 4k content for non-4k equipment. Read this for more detail
- run PMS as offered in the Synology Package Centre, it’s a lot more efficient than running it on Docker and will allow you to use hardware transcoding for sub-4k material
- (with apologies if I’m teaching you to suck eggs) be aware that 4x 4TB disks will not get you 16TB of usable storage. Using Synology Hybrid RAID (SHR) for your data volume you’ll lose the equivalent of 1x your largest disk in the array to redundancy (so 4TB in your case) and it’s strongly recommended not to go over 80% utilisation of the volume as performance is degraded past this point. You may decide that redundancy isn’t necessary, that’s a choice for you to make