Agreed on the location of the radar antenna. Although with windshield mounted radar detectors higher is better, this is not the case with remote mounted radar detectors. A better mourning position is in front of the lower grill.
The position of the shifters are too low. BMWs do not generally offer great mounting positions. A guy on this site that I participated in helping to test in early 2011 in Westchester, NY, had a Blinder M47 with two heads in the lower grill mounted similar to where your shifters are positioned, but he had two additional heads mounted vertically in the kidney grill. I do recommend three or four head installations for the front of BMWs. The only laser jammers that I recommend are Laser Interceptor and Blinder HP-905. The Laser Interceptor performs slightly better than the Blinder.