This is a passive POE adapter. The Deco does not support passive POE. As a matter of fact the Deco doesn't support any POE.

1, Remove any out of the ordinary characters from the SSID of the Deco, or just give your Deco a simple name consists of only letters and numbers. 2, Seems like the Deco only supports APP management...

A to Q2： yes, the third Deco would automatically turn into AP mode, no extra work needed. A to Q1: All 3 Deco would turn into AP mode together with a click of one button.

Let me rephrase it: When steps into bedtime, internet for those in the profile is paused automatically, you don't have to manually click the button to pause the internet.

With Deco under AP mode, there's no double NAT, dont worry about it, it works with your third-party router

When steps into bedtime, internet for those on the file is paused.