Mounting the servo in the middle means the servo output is off centre, the servo is where it is so you have equal length steering linkages which is much more important.
If you think it should be centred for weight balance, the heavy end of the servo is the end opposite the output so ideally when mounted on the centreline it still isn't perfectly balanced. It's simpler to position the receiver and ESC to one side to get the weight balance right, although you can also just compensate for any chassis tweak by adjusting the rear springs.
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