The airflow would be trying to prevent a collision with the front of the wing, and a drone would simply go where the wind blows. Which is to say if a drone flew straight for an airplane wing, it would fly around the wing and suddenly explode in the massive turbulence behind the wing. This would look very surprising because to the naked eye there is nothing behind the wing.
Hitting the fuselage, or entering an engine is probably more realistic. Both would be expensive, but won't be a threat to the passengers. Maybe hitting the wingtips would be doable ... not sure.
It can stagnate to the point of bugs not having much of an issue staying on the wing during flight. I remember a case when I was flight training where we had a little spider as a passenger on the top of the starboard wing for the duration of the flight. The little guy didn't fall off until the wing stalled out when we were landing.
There isn't really any "turbulence" behind any modern wing in typical flight regimes. They're very low drag, so flow off the trailing edge is as smooth as the upstream flow.
Hitting the fuselage, or entering an engine is probably more realistic. Both would be expensive, but won't be a threat to the passengers. Maybe hitting the wingtips would be doable ... not sure.