The location in your photo is pretty good. Good height and antenna exposure. I've used velcro or magnets to attach my radar detector to the top of my tank bag with pretty good results. It lets me quickly detach the detector if I have to run into a store or gas mart. I run the 3.5mm audio out to a bluetooth transmitter that talks to one of those Jabra dogtag-type bluetooth receivers that I wear around my neck with some earbuds so I can hear when the detector picks something up. You could also just run the earbuds directly into the detector audio out.