I have one that mounts on the SMT in place of the miter fence. Two slots in the feather board and two 5/16 (?) hex bolts in the SMT slot to hold it in place.
Almost forgot, "What the magnetic ones don't work for you?'
Uh, okay I wish I had a photo of it... 2 @ 5/16" bolts, and my Rockler long featherboard, the one from the router table accessory kit, and the star knobs and I am good to go... The other way to go is with the miter slot accessory...
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