Should I cross rotate to eliminate this as a possibility?
A 2016 453 'should' have different width tires front to rear, and contis.
The contis are loud over 40mph; I notice the sound and loudness varies with temperature and road surface.
If the noise is tire noise, not much you can do on a leased car but change tires (all of them) but there aren't many brands for OEM stock tire sizes.
I haven't had a chance to try Vredesteins to compare against the contis as far as tire noise but the 17" set of yokohama summer tires I put on are way quieter than the 16" OEM conti set.