Linksys is the sales started of a cheaper series of mesh routers. The Velop dual-band multi-room Wi-Fi mesh system transmits on the 2.4 GHz and 5 GHz band.
The more expensive tri-band versions have an additional 5 GHz band. Dual-band is, however, for most applications, quickly sat. There is a set of three or two ‘nodes’ to purchase for those who are not yet with mesh is started.
You will already have a mesh network of Linksys built up, then you can just have a single dual-band access point in the existing tri-band network places. That way you are a few tens cheaper. Prices starting from 119,99 euro.