With the BMI i run, the holes all line up and i've been able to use the mounts on the servo we usually cut off.
I believe the reason most guys glue them in on the L4's is because of the position. if you were to use servo mounts i don't think you can get the servo in the correct position as the right servo mount looking from the rear of the car would interfere with lower wishbone
So for correct alignment that mount also needs to be cut off thus leaving tape and glue as the only mounting options.....