Mine were one just in front of the other under the stab. I mentioned one on top of the other (servo longways front to back) to you to keep the weight as aft as possible.

They were mounted IN the fuselage on the 1/4 sticks (on the left side). They did not stick out of the back side (engine side) of the fuselage. The HS-225MG was shallow enough that the 1/2 inch fuselage plus the 1/4 inch sticks kept them from poking through. A larger servo would have to poke out of the engine side. I wanted to avoid this to help it stay clean.