Not sure how low the original poster wants to go, or the stated purpose.
On my street driven auto-x car, I have scrapes on the RennMetal front tie downs. Which are just below the LE valance on the car. This is with a set of 19mm raised spindles, 15" wheels with 205/50 DOT-Rs. It was low, matter of fact to low in the rear that I had to raise it to get the handling back on track. New iteration the spindles got raised to fit the 17 inch wheels I would have ran, and adding camber plates and modified strut tops from Tangerine Racing, the Rear was going up 2" to raised the rear pickup points to correct the geometry back there, and the shock towers have been raised with Tangerine Racing tall kit. I never take the top off, suspension travel is more important.
If it was dedicated auto-xer I would still do all the above, except raise the rear with a 3" raised pickup points.
Of course the tie rods where setup with proper bump steer system in double sheer, etc...
Not sure how low you really need to go, but I guess if you want just make the suspension solid do not stiffen the car, and well now you have a go kart. But you can be as low as you want to be.
I would add some titanium skid plates to allow you to scrape if it is good enough for the F1 guys it is good enough for a 914.
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