Meet the Maxwell Mesh WiFi: an open source networking device with 3 x MIMO WiFi bands. You can ssh into any router node to see the config files and run scripts. You can also modify and build your own firmware.
This router is based on OpenWRT. That means you can use plenty of additional packages to build your network. This mesh router comes with WPA3 encryption. It supports up to 17 mesh router nodes and 230 simultaneous clients. It covers an area of 30000 square feet.