I made my own. On my '06 the Iowa cop at the scene of the accident started giving me a difficult time about the mount. He didn't appreciate my sense of humor when I told him it was behind the tire before the SUV rear ended me.
For my new mount, I just cut a piece of sheet aluminum in an inverted "T" shape to hold the light and plate, then bent the tabs to use the passenger peg mount holes.
I haven't had any problems with law enforcement, and most sport bike guys set up their plates this way in the Denver area, that I've seen. However my friend just got pulled over last week for the placement of his plate. So I don't know maybe the winds of change are on us.
I say do, the worst that will happen is you get a fine, and I think it's $15. At which point, pay the fine, don't move it, and consider a finance fee for having a cool plate mount.
I just had to make this decision - after speaking with a Long Beach Sergeant and Ducati rider, I mounted it under the taillight. He said that the CHP will use it as an excuse to ruin your day if you are on any fun roads. Note that I have Chain Reactions so the visibility to the plate is obstructed.
So here it just depends on whether it is the Highway Revenue Rangers looking to pinch you on a fun ride or a local PD.
"On my '06 the Iowa cop at the scene of the accident started giving me a difficult time about the mount. He didn't appreciate my sense of humor when I told him it was behind the tire before the SUV rear ended me."
my plate is in a similar spot....about 2 inches further forward. no problems (yet...damn't this better not be the cause of problems). i have a light on it as well so will deal with the po po when if/when it happens. i think most around here (chicago) are pretty cool (until i get popped for something) and wouldn't care or waste their time on such matters.