Two-up, at least somewhat if maybe not so high up, isn't that uncommon in Fboats. Have seen the daggerboard several times aboard F24mkII (M. Parsons, excellent sailor) and once aboard my F27GS (blowin' stink, almost accidental).
Maybe both hulls weren't actually flying, but it sure felt like it and I figure if I can see the 'board on an Fboat that's two hulls up.