https://www.pcgamer.com/best-mesh-router-kit/

When your home or office is too large for a single Wi-Fi router to cover in wireless signal, a mesh router kit can help spread the signal. The best mesh router kits use a series of nodes, typically two to three, to blanket the home with the wireless signal, covering every nook, cranny and closet with a usable internet signal. 

Currently, mesh networking gear can be divided into two designs. The "true mesh" design features a series of identical and interchangeable devices that all interconnect wirelessly. The second is known as a "hub and spoke" design, which uses a router and one or more wireless extenders. These days, both categories of gear are marketed and sold as a "mesh kit," so we included both options in this guide.