If you look at a lot of current cars you will see that the factory air dams are not a continuous depth from side to side. They are lower infront of the wheels and higher in the centre. I suspect this is to give the benefits of less frontal area in the centre, and also to deflect the air away from the wheels. Your best approach may be to cut out the centre section of your air dam by a few inches and curve your undertray up to match like you show with the yellow line.
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