How is your new car Simon? Are you liking it?
Up to now it's fine being down there, it's a bit higher than the fitted Sat Nav anyway but you don't have the MFD display.
The voice commands are very good too so it's rare when you have to look at the screen.
To add the spash screen, just browse to the tomtom in windows explorer and find the image folder.
I think you could mount it a bit higher, it hooks behind the fascie so as long at there is 5mm of space behind the climate control fascia, it should work.