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Central TX, so very temperate. I run 20" wheels here on my sports cars, with much lower profile, and have had zero issues. The Inductions are the best looking wheels they produce currently, IMO, so I'm fine with the "risk".
For what its worth, maybe you already realize this, but - a 255/40 tire on the induction wheel, has barely less sidewall than the stock 235/45/18 tires on the model 3 aero wheels. 4" vs 4.2".
People need to stop saying 20's like they're these huge wheels with small tires. Its a crossover, it has LARGER tires on the wheels. THe size of the wheel is seemingly irrelevant. You should calculate the sidewall size to really determine what makes you comfortable.