Chosen Solution
These routers so far tend to be single point access. So far I have not seen any mesh router offerings. So depending on your home layout one unit might be enough. I have found I needed two meshed routers to get full coverage. I have friends who wanted coverage beyond their home needing even more units to cover other buildings and back yard.
Sadly, no suppor for WiFi 6 yet! dd-wrt Forum: Is 802.11ax and WiFi 6 supported? & openwrt.org