@DIYamiwhy 

Hi there! If you're looking to wire all your Deco X20 units, running Ethernet cables through the floorboards and down the walls is definitely the way to go. This will ensure the best possible performance and stability for your home network. As for advice on the Best way to do this, I recommend planning out your cable runs beforehand to ensure that you have enough cable and that each unit will be properly connected. You may also want to invest in some cable clips or conduit to keep the cables neat and tidy and protect them from damage. In terms of the actual installation process, it may be helpful to enlist the help of a professional electrician or network installer. They can help you with the physical installation and ensure that everything is properly grounded and connected. Overall, wiring your Deco X20 units is a great way to maximize their performance and ensure a reliable home network. Just be sure to plan ahead and take the necessary precautions to ensure a safe and successful installation. Good luck!