Well, now we know. I mounted the mini Farkle shelf to my Madstad today. Turns out it's a pretty good fit. The install is straightforward but a bit tedious depending on how many devices you want to add. In my case, I have a radar detector, a double USB weatherproof socket, a Garmin Zumo, an XM radio/antenna, and a Mobius action cam. I'll be posting pics in a day or two.