Question about Ubiquiti UniFi Dream Machine

I have found another guide that can help with a current DSL or Swisscom Fiber when switching to an Edge Router or a Dream Machine: https://www.mybetacube.de/forum/index.php?thread/243-howto-swisscom-dsl-fiber-ftth-mit-eigenem-router-betreiben-ersetzen-ubiquiti/#post286