If it was my plane and I was just starting out I wouldn't even put ailerons on it. As a beginner your main goal is to learn how to take off, land, and make some gentle turns. That plane will fly well with only 3 channels. Rudder and elevator on the right stick and throttle on the left.

I had that Eagle 2 with only 3 channels and mine would roll, spin, and fly inverted so easily. Having only 3 servos made my plane lighter and I didn't have to worry about 1 or 2 aileron servos go bad on me.

But, if he wants ailerons I'd use just the one servo in the middle. If he wants 2 I'd put them about 6 inches out from the side of the fusalage.

Good luck

big dan