How to add & link 3 economic dots to alexa

[Ljjr]

How to add & link a third echo dot?

[mike27oct]

The same way you added the first and second ones.  I have 4 Dots, two Taps and an Echo connected already.
Alexa gives each device its own name, e.g Mike's Dot, Mike's 2nd Dot, etc. as seen in the app.