My RD mounting location is kind of unique. It is inside of the small rectangular Cordura case, Velcro attached to the top of the Bags Connection tank bag.
The RD is just an old Escort Passport 8500, long overdue for an upgrade. When I do the new one will be mounted back in the same place.
Inside the tank bag is my Starcom1 intercom and the DC Power source for all of my gadgets, with a single power cable into the bag (from battery tender cable). So the power and audio cables for the RD just need to run from the tank bag lid down inside. Neat and tidy. I use the audio only for alerts, and that has worked fine. You can tell how close and what band they are on by the tone and beeping rate.
I like using the Cordura bag because it (somewhat) disguises it from being a Radar Detector to casual observers. Being on top of my tank bag, when it rains I just pull the big shower-cap type rain cover over the whole thing.
Using the cordura cover does mean that optical Laser Detection is inoperative. I think that is OK since Laser Detectors usually only tell you when it is time to pull over to collect your award. I can also take it out of the Cordura bag, since the bottom of the RD also has Velcro on it (it is Velcro-ed inside the bag so it doesn't move around)
I have three street motorcycles in the garage right now, each of them is outfitted with a Bags Connection tank ring, so that tank bag can be quickly switched between the three depending on what I feel like riding, allowing me to use the same electronics on all three bikes very easily.