That panel on the right is just a cover on a F6B.
That is where I thought would be a good place to mount one.
Then again, I have a hard time bringing myself to drilling holes or defacing a part in any way.
Here's a different approach altogether. My Passport Escort 9500ix radar detector is mounted on my farkle shelf and displays the voltage as an option. Not that seeing the voltage is really necessary for me...