buy a mount or fabricate one
Yeah, I can imagine the detector becoming a $300 hockey puck. I used a piece of 1/2" aluminum angle iron. Cut the piece the correct width, bent it a little, and added a couple extra screw holes. I attached mount straight to the wondshield mounting arms. The design came from the pictures I saw from other mounts. There is industrial strength velcro you can pick up at Radio Shack. Then I quick tie down. Works great, all together I spent about 1-2 hours and ~$20 in supplies.
If don't have the time, then buy the mount from pirate.