The only issue here is that you may not get full deflection using this method as compared with the same servo arm in the one that is fully exposed. I've done both methods and, as both RCKen and Minnflyer said, I have had no problems at all with this. Just be mindful of this possibility. The servo arm could bind up with the slot in your wing. Being careful in your setup and allowing for full movement of the servo arm will give you what you want.

Center the servo arm carefully before making the connection then make sure that your stick deflection does not cause the servo arm to bind with the wing surface. If it does, then make the necessary adjustments (end points for instance).

CGr.