From
http://ec1.images-amazon.com/media/i...L000070757.pdf
"The successful reception of the long wave signal depends on the positioning and location of the clock. Insufficient signal strength or external electrical noises may prevent the unit from receiving a complete signal. The main reasons for poor reception are heavily reinforced concrete and steel structures, and close proximity to electrical units such as TV’s and PC monitors."
I think Audi moved receiver unit from standard recess behind instrument cluster to middle of dashboard for facelift cars because of new colour LCD display that can interfere with long wave reception. Just my guess.
If yes, then perhaps that makes middle of dashboard not a very nice place to fit receiver for cars with RNS-E.
On the other hand most of time car is parked, so LCD screens are off and receiver is always working... Just thinking...