In my case in a house where coax cables had already been drawn, and no empty lines for a UTP cable to pull.
Tried a Devolo DLan solution first, but had a lot of problems with this.
Replaced for the Hirschmann adapters over the coax cable. The adapters are made of metal and all feel very good quality.
Connection is fast (1Gbps), constant and very stable. Connect according to the manual, no further settings are required, the adapters find each other automatically.
The only points I could mention is that this set did not include plugs, only USB cables. And pay attention to the coax connections, if only F-Connectors are used in the meter cupboard. I ordered these separately elsewhere, as well as the plugs.