Rans..
Take from this what you may but here's my set up...
Skydemon running on iPad on a RAM mount on the right of cockpit angled for easy viewing. iPad gets GPS position from Bad Elf pro via Bluetooth. When fired up Bad Elf can live in flight bag or pocket - it's completely robust in reception.
Pilotaware Rosetta (the new kit) fixed mounting and wired in with output on separate iPhone 6 mounted on left of cockpit and in my left field of vision. The reason is I don't look at the Skydemon all the time and its traffic display gets a bit "lost" in the map background. The iPhone I use to display only the "radar" screen which mimics the sort of TCAS display I'm used to from my previous day job.
For nav back-up I have an old Garmin 495 which also runs the Tru-track autopilot.
I have quite a few flights with this set up and am very happy with it - but as Beagle would say "keep a good look-out"...