I've got a fully installed Pogo alert to the right of the instrument binnacle similar to where mmmmfive has his. I'd take a photo for you but BMW have my car and i have no idea when i will see it again. In fact they have now called me 4 times in 3 days to ask why my car is there and did i know it had a parking ticket on it! If i ever see it again and resolve the mystery parking ticket fiasco, i'll do a photo. Might have to wait a while is all.
IMHO Pogo is the best and the placement where i have it is the neatest, particularly given the slope of the z4 dash. I also have the optional separate infrared thingy and that mounted to the left of the rear view mirror, nice and tidy.