need help choosing the my orbi system

I have a 3 story house with a topology that doesn't allow for the routers to connect over wifi (with my regular router there is no signal downstairs)..

I need a solution that supports the following topology (see attached photo):

1. Top floor (near the street): 1 router connected to the Modem 

2. Middle floor: empty

3. Down floor - 2 apartments:

3.1 apartment 1: 1 router connected to the topfloor router over LAN.

3.2 apartment 2: 1 router connected to the router in apartment 1 over LAN(preferrably) or WIFI.

Each router will also need to connect to a smart TV and run netflix. 

Which is the best system for me? 

Do I need 3 routers system or one router and 2 satellites?

Do all systems support connecting the routers in a row (A->B->C)?

Thanks in advance