I never followed up on this....
Many months on and I went for the Spider Podium. It's minimal design is wonderful!
My Alfa GT has a cup holder and card holder slide out draw fairly high in the dashboard, it is here that I've mounted it. Perfect for controlling audio playback and maps visibility. I've got an USB cable popping out of the card holder too, so if I want to tidy it away I can quickly remove the Spider Podium, close the little draw and it all looks normal :)
PS - if anyone is reading this with an Alfa GT, the Blaupunkt Bluetooth adaptor works with the factory fit radio (although Alfa says it doesn't) and makes phone appear as CD changer: http://www.bluespot.co.uk/car-audio.aspx/7607545500-adaptor