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Not all obvious thing need to be read from articles. There are articles also in this matter posted in this forum that lower is better for the spats. If you look how people have to park cars inside cities the front of the car is totally on top of the curb. Almost half of parkings is done like that for example in dusseldorf where I currently live.
Cars which have some kind of bumb in front the flap usually have little higher ground clearance. The id3 has also bumb in oem bumber but ground clearance is close to 180mm to the bumb. Optimal shape in general is round like to front of the cars bumbers. The ID3 oem has round shape which is in the bumber.
All super slippery shell ecomorathon cars etc air is directed away from tires and little as possible tire is visible from front perspective.
If your flaps are longer and due to that closer to ground when you try to drive over the curbs they are broken instantly. Flap bends and is tear off by the curb and tire. If you dont drive in areas where you have to park close to curbs or drive over them again you can optimise the shape more to suit your driving situation. Thats is the situation in kitee Finland that almost never that curb parking is needed.
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