Currently, NAS devices are not formally supported for Hardware-Accelerated Streaming. However, a few high-end NAS devices run 64-bit Linux and come with Intel processors that are capable of Quick Sync Video. Those devices may support Hardware-Accelerated Steaming when enabled.
However the Plex NAS Compatibility list shows hardware accelerated transcoding support
Thanks for the reply. I have not purchased my NAS or Plex Pass yet - I am trying to figure out which NAS to get. In my research I found the two statements which appear to contradict each other.