@Alexandre. Possibly but I don't like the idea of running cable over 3 floors.

@gwinegarden 

You will have to wire Main Deco regardless if you run it as a router or in AP mode.

As for Satellite nodes, you don't have to wire them in AP node if you don't need to. I have three Deco nodes running in AP node: Main is wired, one Satellite is wired and another is not.

In fact, in AP mode you have more flexibility on how you deploy Satellites nodes. For example, my Main and Satellite wired nodes are each connected with Ethernet cable to ISP router/modem. That won't work if I switch Main node to router mode.