The manual explains to mount the elevator servos in the stabs, I found it very hard to fit them there, and even harder to make room in there for the ply to attach them to.
I choose the fuselage mounting instead, makes it a lot easier I think (and no connectors, which is nice).
Now I'm just waiting for the carbon double horns from Digitech, then I will discover if there is any hardpoints in my elevators []