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If you are interested in lowering both drag and lift, looking at what race cars do is a waste of time. Only solar race cars are interested in low drag.
There are two ways of reducing both lift and drag.
The first is to stop air getting under the car. This was widely used on old cars that had very rough undersides. A front air dam will do this (and it actually doesn't need to be sized to not increase frontal area, because Cd will usually drop at a faster rate than the frontal area increases). It should be as far forward as possible and definitely not like the pictured Golf. (That position is causing a small amount of lift).
However, basically no cars of the last decade use the 'stop air getting under' approach. Instead they use smooth floors and so gain high speed flow, that reduces pressure under the car to decrease lift. Even a front undertray alone will partly do this. (If that's your red car in the pics it almost certainly already has a front undertray.)
So if you have a car less than about 10 years old (not all cars, but most), a front air dam is subtracting from the effectiveness of what the manufacturer has already done. Improving the undertrays is, to my way of thinking, far more logical. Do you have any pics taken under the car?
(Oh yes, and I am not a fan of splitters for either reducing lift or drag.)
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