Thank you BMF. That's what I wanted to know. What I needed to add on, the Echo to achieve to use the Play 1 to enable Alexa. Appreciate it.
Perhaps my wording was not precise. Problem solved.
You can actually use the Alexa component that’s built into your Fire Tablet... in fact there is an option to leave Alexa 'on' and listening for the wake word. You just need to install the Sonos Skill in your Amazon Alexa App smart-home section and scan for all Sonos devices.