No. It’s best to think of mesh system as a replacement for your existing router’s Wi-Fi. You attach one of the devices from a mesh Wi-Fi kit to a spare network port on your router and it creates a new Wi-Fi network to which all your phones, computers, tablets and Wi-Fi smart home gadgets connect. You then place the second (and third if relevant) mesh device somewhere else in your house, typically on another floor. The devices all talk to each other and create a single Wi-Fi network that’s both strong and fast across your entire home. The only reason you may find you still don't get whole-home coverage is if a) you have an extremely large home or b) your home has very thick stone, brick or concrete walls.