I have the same LA. I went to a demonstration given by a Pfaff LA representative. She just used the regular hopping foot that's already on the machine (no special foot) and she didn't use a base. The ruler butted up next to the foot and she just moved it as needed.
I hope someone else with more understanding speaks up. I purchased a few basic rulers and I finally have time to play with them, but I don't remember too much of what I learned at the demo and I'm terrible at trying to find youtube videos to explain things. Technology isn't something I excel at...