I did install Alexa for another project about two years ago.  Boy it was a long progress and now it seems to have been simplified.  I used this script to get  the app up and running:  Simple Alexa .  Please note that the Product ID has to be my_device and the the Client ID is found under security management settings or its not going to work when you set up config.txt. I am using the ultra low cost Logitech C170 web cam for the microphone. I'll be updating the log with some testing of the microphone.