Orbi coverage recomendation

That's a large area to cover. Having the modem at one end of the house will make it harder to cover the area.  Orbi is a star topology, with all satellites needing to connect back to the single Orbi "router". I don't think you would get good coverage with the Orbi router at one end of the house.

To cover your house fully, it would be best to run several Ethernet wires from the modem to the middle and far ends of your house, then install several wired WiFi access points. Something like the Ubiquiti Unifi APs would work.

Or you could try a true mesh solution, like Eero.

You could try running a single Ethernet wire to the center of the house, and putting the Orbi router there, with satellites on either side. Coverage would depend upon the house layout and how far away you could place the satellites and still get a good connection to the Orbi router.