You're right. The AS3 plate seems to use the same mounting points as the flimsy plastic "under cowling" that came with early Vees.
Therefore it's attached to the oil cooler in the front, and engine in the rear.
Looks like the SW Motech one mounts the same as my Enduro Guardian: crash bars in front, bracket attached to frame in rear. Only drawback I see is that it insists you have to have SW Motech crash bars, and specifically states incompatibility with any other crash bars. Bummer, if you already have Givi, Happy Trails, or other crash bars.
2007 Vee with too many farkles and 50k+ (s)miles