AdMob will display ads in unity at the game facility
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To map a point of the world to a screen point, you can use this: http://docs.unity3d.com/ScriptReference/Camera.WorldToScreenPoint.html . With a few calculations, you can find the measurement and position of your world object in the scene. However, I do not think that ads can be sorted or placed freely to suit any of your needs. Lately I've been working with admob possible ad placements where ex: top-right / bottom right etc. are predefined.
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