Sorry Tilly i missed this,
Haven't found it to be a problem once you have your suspension and ride heights setup, the only time it is close is when the car is full jacked up. As Paul said a 25mm spacer is also used under RS3 to lower the tray to the floor level. If it is found to be an issue then the side can be trimmed to allow the lower wishbones to move past the undertray.
Hope that helps....Andrew
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