Which is best for my room (from a total novice)

I have recently bought a Sonos five for a large room (5 metres wide by 12 meters long) and will look at putting this up one end of the room (its a Kitchen / Dinner) and the other other end i was about to buy a second Sonos 5 but am now contemplating with having 2 x Sonos era 300 as well as the Sonos Five? 

Im not a music guru but just want to be able to play the music off my Phone and have great sound and wondered what others would do / consider? 

The room isnt ready yet but will be in a few weeks and happy to spend the money up to another £800 if its worth it 

So to sumorise,
2 x Sonos Fives or
1 x Sonos Five and 2 x Era 300