I had a Minoura Suspension rack that attaches to a seatpost that I tried to put on another bike. Because it attaches to the seatpost it makes the bikes a major pain to fold.
My Ignio has no bosses to attach a rack to. So I figured out that if I flipped the seat attachment from angle up to angle down that it worked like a champ. All I had to do was to get some longer screws as the rack itself lays on the tubes instead of the flat portion of the seat post attaching piece. Made it about a half inch longer reach to the plate that secures the 2 screws that hold it on.
Instead of attaching to the seatpost it fits to the frame so the fold isn't affected at all. And it doesn't touch my Thudbuster.
Works like a champ.