I fully understand leaning on "luck" is antithetic to our fact/logic based discussions here. I also think what the final intended purpose is of the exhausted air from applying any suction attempts is probably irrelevant, as long as that exhausted air does not cause other un intended consequences. I have not addressed any Reynolds calculations, and If i was to take a wild guess, I'm in the area of 50% of chord length for the proposed inlets.
And while I am wandering around outside the box, I'm exploring putting the suction fans on a variable brake line pressure sensor timed relay and a soft power off, meaning they only kick on under real braking, ie not a tap, and they stay on awhile while car re accelerates after leaving a corner, these are both times, when rear tires can benefit from maximum DF, or the time I want maximum DF from the rear wing. Of course this all depends if I can keep the rear smaller sized rotors within a proper temp.
https://allstarperformance.com/in-li...n-hd-all13009/
When car finally gets to A3, it will be a real pass/fail easy test of efficacy.