I am building a plane that has a split elevator. The two elevator halves are not connected to each other. Each has a push rod. The two push rods are connected together inside the fuse and then to a single servo. This is essentially a "Y" with the two upper sections of the "Y" going to the elevator halves (about 12 inches long) and the bottom portion (2 inches) going to a single servo.

My questions are:

1. Does the part that connects to the servo have to be in the exact center line of the plane.
2. If it is off center by about 1/2 inch, how will it effect elevator deflection. Will one elevator deflect more than the other (major, minor, none at all)

My crude math tells me that the effect will be minimal. Please advise...
Thanks,