I used a friend's Viewfactor FMJ bottom plate and 15mm LW mount, and they're perfect. Ordered them the same day. The RED QR plate bolts on the bottom of the VF plate and it all fits together perfectly. I use short redrock micro carbon rods, can't remember if they're 3" or 4", which fit everything perfectly under my CP.2s.
Edited to add: pic of my Scarlet w/ my friends' O-Connor O-Focus (photo version, with the smaller hard-stop knob.... I ordered the cine version with the slightly larger knob.)