It depends on how much area you need to cover.
But here's a little extra info to help you decide:
One Wyze Mesh Router System (2-Pack) can cover up to 3,000 square feet while a Wyze Mesh Router Pro System (2-Pack) can cover up to 4,000 square feet.
Each individual Wyze Mesh Router and Wyze Mesh Router Pro covers up to 1,500 sq. ft. and 2,000 sq. ft., respectively.
You can have up to 10 mesh routers on one network, with no more than 2 hops from the root router.