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Cross wind aerodynamics is one thing I have zero understanding of, but would like to delve into.
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At small angles: Morelli's Banana car. At high angles: NASCAR rooftop fences to spoil lift when driving sideways.
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It is interesting they would have a higher pressure in the center than the flanks of the floorpan.
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Consider the Aerocivic; it goes to great pains to contain and segregate wheelwell turbulence and underbody airflow.
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Ferrari seems to be doing the opposite with their strakes... Even if vortices are weak, they're diverting air away from the center and towards the outside of the floorpan, making the center the lowest pressure region...
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Once again, I don't get strakes, but I compare to the driprail on the roof of my Superbeetle. I think the strake at 45° angle will (like a Gurney flap) roll the air toward the center of the car, not deflect it outward.
If it operates as you describe, the rearmost strake ends way early.