Sounds like you have 4 Sonos Zones wth 3 in wall speaker zones. Looks like the biggest variable here could be wireless performance in your apt. and potentially your installation skillset. Technically it is not difficult to install an inwall speaker however NYC apartments present interesting challenges. You did not maention if your walls are drywall or Prewar building plaster.

Also note that if your apartment is fairly large wireless may not work very well. You are actually much better hardwiring a SONOS system if you can (Setting up a LAN). This way it works best.

The monies involved in what you are proposing are significant at least 1.2K or more for speakers and install materials.

You should also consider small speakers such as the Monitor Audio Radius Series Speakers. They sound great with Sonos and are easy to place and setup

Sonos is fabulous when setup properly. However NYC apartments are not the friendliest landscape for a Sonos system.

Here is a link that might be useful: Monitor Audio Website