I found this explanation online
Max Load Rating - This is the maximum load that a wheel is designed to carry. This load is calculated from calculating 50% of the GAWR (gross axle weight rating). If, for example, the GAWR of your vehicle is 2200lbs, you would need a minimum load rating of 1100lbs per wheel.
I then found these specs for the CX-5
U.S.A. and Canada SKYACTIV-G 2.5 Item Weight
AWD
GVWR (Gross Vehicle Weight Rating) 2,143 kg (4,724 lbs)
GAWR (Gross Axle Weight Rating)
Front 1,100 kg (2,425 lbs)
Rear 1,043 kg (2,299 lbs)
So if I take the GAWR of front axle and divide by 2 it is just over 1200lbs. That should mean my new wheels with rating of 1521 should be fine. I think.