Accessing content on NAS

Hello,

I just got my Asus Chromebox setup as Plex client base on this guide http://www.cuttingcords.com/home/2015/1/2/turning-a-chromebox-into-a-full-fledged-plex-home-theater-client.

Does it mean i need to setup Plex Server on my D415+ NAS ? Or is there any alternative i can have Plex server setup on my ChromeBox then access the content store on my Synology NAS


Best wishes