No need to have a cargo rack to install the fenders, or fenders to install a cargo rack.
The Racks and fenders are independent of each other and can be used alone or together.
Please note that racks and fenders designed and sold by ZiZZO are specifically designed to work with your ZiZZO Bike. We cannot guarantee if third party racks or fenders will work as well.
Using ZiZZO designed racks and fenders will not affect the overall folding and compactness of your bike.