I disagree that the note in the manual about bumping up psi in snow tires is to account for a drop in ambient temperature for winter. I believe they would state that if it was implied.
I’d lean towards it has to do with the softer rubber compounds used in their design and how it affects drive...
General Altimax is a good choice too. You can get them studded if need be. I used to have them in 17”s on my CX5 GT in the winter. Thing was a traction beast.
OEM Cargo Mat. It’s a 2 piece design that has easy folding to allow access to the under-floor storage compartments. Found it for 20% off with free shipping.
Husky XACT Contour Floor Mats. I’d give the driver side an A+ and the passenger side a B+ (one gap on the left/inside about half way up). Still waiting on the rear piece after a month.