Also running a 120 Reba on my Anthem. Run about 20% sag at 80psi. Have one token fitted. Tried two but it ramped up a bit too much and I wasn’t using all the travel, and dropping air to compensate made it a bit soft and divy in the initial stroke. So I went back to one as I find that the best setup for my riding.
Easy to fit, just let the air out (important), unscrew the top cap off the air leg (24mm socket). The tokens screw on the to bottom of the air cap (your new Reba’s should have the token compatible air cap, older ones don’t), nip up the token with an 8mm (?) allen key. Assembly is the reverse of removal 🙂