The Deco X90 is one of the fastest mesh systems I've ever tested, and it costs less than half of what it used to.
As is normal practice nowadays, to get the Deco P9 set up, you first download the TP-Link Deco app, and then just follow the instructions. It's a case of just plugging each of the devices in ...
Meanwhile, download the TP-Link Tether app on the Google Play Store or Apple App Store. Follow the on-screen instructions to create your Tether account and set up your TP-Link Archer BE900.