I use a few year old Linksys Velop mesh system. 3 ac 2200 routers and a Arris SB8200 modem. 1Gb internet connection, although you'll never see more than 866mb through your wireless router. One in my bedroom/office, another in the living room and the third upstairs in the dining room. A little over 3 acres of solid fast coverage.
As of right now I have 39 devices connected and more when others come home. 4 phones, few lappy's, desktop, TV's, apple watches, smart bulbs and switches, etc.