Not really, the A pillar is on an angle that would make the horizontal plane of the driver aim down at your seat. If you go above or below the speaker, the response drops substantially.
This picture shows the side view of the dispersion pattern of a flat panel driver, followed by the front view, and finally the top view.
As you can see, the vertical dispersion is very small. Getting out of the horizontal plane make the high freq drop substantially. So if it were in a home speaker and it was ear level when sitting, standing would make a substantial differnce, but moving left or right would not.
In this picture, it shows the dispersion again and the optimum speaker placement. The Driver could rotate along the curve without any response problems, but simply moving it up and down would not be good.
