Better make WiFi routers hubs between every 20ft and interconnect them as mesh network this way your setup will be many times more robust, speaking from experience, on the job we have internet cables drawn inside walls so they aren’t accessible and some cables can lose some signal strength after a few years of usage, these hubs are mainly for strengthening signal at key points, but also if at some point signal is lost then WiFi bridges can act as temporary solution until you find where is that cable in chain of cables and replace it