G'day - I need help with setting up wifi coverage of a rural property.

Up until recently I have been using TP-Link AV600 Powerline units to run internet signal between two buildings and then a UniFi AP to beam WiFi within the building, unfortunately after installing solar there seems to be too much noise in my cables and the Powerline units don't carry the signal anymore.

I am thinking of purchasing a mesh system and looking into the Deco range of products, but man there is a few to choose from there!

My property layout is: 3 buildings that are about 20 meters (60 feet) apart with clear line of sight between them, ideally the signal would penetrate 2 external and 1 internal wall. Our goal is to have consistency and reliability of signal rather than the speed of the internet as we mainly need connection for work communication rather than gaming or HD streaming.

Any insights/recomendations will be appreciated.

Cheers

Roman