https://www.cnet.com/news/d-links-tri-band-mesh-wi-fi-offers-range-flexibility/

D-Link's newest mesh Wi-Fi is a triband AC2200 system due out in the second quarter of 2018. The two-pack will cost you $320 (about £235 or AU$400) and cover up to 6,000 square feet (about 570 square meters). 

That's an impressive range compared to other current mesh systems. With two units, for example, the Google Wifi covers only 3,000 square feet (280 square meters) and the Netgear Orbi covers 5,000 (465). The Linksys Velop covers 6,000 but needs three devices to do it.