It's not. Ideally, you will want both the arms pointing either up or down, with the position of the arm with the least amount of offset from one end of travel to the other being the best.

Just set the elevator servos in the lower openings and then run the rudder cables through the slots to see where it all comes out to find out if you will have any trouble. The worst you can come out is to need to cut two small pieces of True Red Ultracote to cover up the lower holes.

Another thought is to use servo arms on the elevator that are no more than 1-1/4" long. If I recall correctly, I may have ground off the ends of the arms to 1-1/8" to clear the bottom of the horizontal stabs with both arms pointing up. I'm not home for awhile so I can't go out and check, but I didn't need any more servo arm than that which would easily clear the stab for full deflections using the upper servo holes in the older versions.