That is the “anti flopping” reduction mount advice from “the internets”. The Internets said recent RDF tests confirm, dual suction mount angle like this works. The internets said laughing can be heard by testers how they could avoid police mounting the radar powered police finder in this manor.
This almost looks like a cut and paste edit of so many others seen on this post. So many do this. Is it really done to keep the vibration/flopping down buy the blister pack RD buyers? Guess one will never know. We see these creatures driving, and then abandoning their cars. It is rare sighting to be able to walk up to them with their door open to ask.