I have the H&R lowering springs on my Quad (I think they're roughly 1.6" drop) and I do notice the rear camber is off a bit. Not horrible. Sadly there are no adjustable rear control arms available yet for the Stelvio. I think there are for the Guilia.
2018 Alfa Romeo Stelvio Quadrifoglio Missano Blue - Forza Exhaust Controller, H&R lowering springs, Ceramic Coated
2019 MV Agusta Dragster 800RR
2007 Benelli Tornado Naked Tre 1130