If all the media you want to access will be on the MPW, you don’t need Plex. Since you don’t even have a MPW yet, perhaps you don’t know you can connect the MPW to your own home network or other hotspot. If everyone will use the MPW this way, they also can all connect to it wirelessly via its direct wifi signal using the My Cloud app or another DLNA receptive app, and there are quite a few of these. The only reason I put my MPW on the home network is for wider range access anywhere in the house because my home network wireless has greater range than the MPW direct wifi.