I have also had a request for some info on how I mounted the Zumo in the centre of the Deseirto III.
Well actually it's easy. I used the Touratech mount that goes onto the four handlebar mount bolts and it has worked perfectly now for about 3000km.
The top holes with the rubber well mounts are already the fairing, and I drilled two holes for the bottom two. Took about half an hour!
Here it is in action, albeit with the older crappy Touratech dashboard.