.....on the left edge of the storage slot below the HVAC. My car has two DIN sized cubbies below the HVAC and I put it at the bottom left edge of the bottom cubby, in front of the shifter.
I can easily hit it with my right pointer finger to initiate a phone call, ask Siri for help, etc.
Works like a champ.
Gives me full Navigation, Hands free phone, music streaming, etc., in my nice, "Last Analog" Porsche Boxster.
Learn it, love it, live it!