David, you're safe if the control horn is behind the hinge. This will cause slack on the side opposite to the pulling cable, but this is not a problem. Some people may not like the slack but it doesn't cause any catastrophic effects because the air flow will be pushing the surface back thus creating the tension needed by the pulling cable. So even though the opposite cable is not pulling back the air flow does the job.

Personally I think you can setup a pull-pull just about any way you want to and not have any major problems as long as you don't created the dreaded anti-Ackerman by having the cables shorter than the distance between the hinge centerline and the servo centerline.

KeithB