The Arc with one Sub and two One SLs for rear surrounds is sufficient. Unless you have a very large room and require more bass, two Fives as surrounds and a second Sub is overkill for most settings.

The Amp cannot be added to your current setup unless you want to replace the two One SLs with a pair of in-ceiling or in-wall rear surround speakers powered by an Amp.

Thank you Brother. The set up will not be in a large room. I am used to an audio file type setup for home theater. I like full sound with a tight bass. I ran a Rotel Amp and receiver with paradigm speakers. I know this isn’t that but it was time to down size. After researching my options Sonos seemed to fit for what I was doing and has a great rep so I thought I’d give it my ears and see how it goes. I haven’t heard the whole set up so I have no idea. I just want to feel the music and action my friend. 
Thanks for your input 

The setup Guitarsuperstar mentioned above would be perfect. I have that in our home theater and it works great. 

Thanks. I’m looking forward to it. It should arrive tomorrow