Right, in a windmill they're mounted at an angle for generating rotation. When you mount them on the fuselage you just set them at an appropriate angle for the aircraft.
It would need half the turbines to turn the other way around to have left/right wings, doubling tooling cost for production.
And it would need a runway of appropriate width, but maybe they could be mounted at significant v-shape.
Return trip not on the ground. The fuselage, engines, ... would still be massive, but with a set of small "normal" wings.