Two rudder servos is massive over kill if your using an 8611, 5955, or 8711. Tail mounting one or both works just fine and is easy to do. That's how I do most of the Wild Hare planes I have to offset nose weight. Only two so far have had a pull-pull, and then only for balance reasons. It's also more positive than a pull-pull. They fit in the holes provided for them with no problem. You may find that using only one works out a lot better for weight and balance as well.