Visa for a German / Canadian living in Mexico

I am German and Canadian holding both valid Passports.

My permanent residence is in Mexico and I have a Mexican permit for that (FM 2 Visa).

On my way to Australia, I will fly with Air China, I like to visit Beijing, Shanghai and Guilin.
On my way back from Australia, I like to see some other areas of China.

Each of the stopovers will be 8 days with a 30 days travel to Australia in-between.

What kind of Visa should I request to receive?