Hi Robbo -
Yes, you can separate your audio setup from your NAS, UPnP service, router, ripper, and so on, using an Ethernet cable. Most of my stuff is in a closet about 40' and two rooms away from my Naim setup. My ripper is a laptop in yet another room, but all are connected via the network.
Your iPad is wireless, and if you download the n-Stream software, you can use it to control the NDX . In addition, if your run an RCA cable from your NDX to your Naim amp (the modern black ones, that is), you can also use n-Stream for input selection and volume control (Naim calls this "system automation").
All of this makes the choice of listening chair or couch very important, as there is rarely a need to get up.
Good luck!
Hook