Ronja can be used for last mile solution because it's range is comparable with the typical last-mile length. However it fits only to situations where there is a direct visibility between the access point and the client.
A typical last-mile installation comprises of a number of Ronja devices installed on the access point, connected into a switch or router. Each client has his own device installed on a roof, balcony, on outside wall of the house or behind a window.
Ronja provides virtually zero round-trip. Dropouts on Ronja are also correlated (not random as on WiFi where they are caused by interference), so reliability doesn't degrade significantly with number of hops connected in series. Therefore one client can be used as a retranslation point to another client, increasing the reach of the last-mile connection.