Aside from the aerodynamic shape of the wing, it’s simply easier to hang something heavy than to support something heavy on a stand.
When you hang the engine off the bottom of the wing you’re using gravity’s own force to keep the engine in position.
If it were mounted atop, then the forces of gravity would want to pull the engine downward and you’d likely require more material (weight) to support the engine in place.
Weight is the ultimate enemy of flight.
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