These are great drawings.

#1 "works" as long as this layout provides adequate coverage of the areas that need coverage.

Requires no additional equipment.
Requires no additional ethernet wire.
Can be tested immediately.
May not be a great use of the Orbi WiFi in the basement if there are no WiFi devices in the basement.
Additonal devices can be wired to the two upstairs satellites.
One Orbi LAN port remains which can be used to connect one additional upstairs device to the Orbi if ethernet wire goes to the location where the device is placed.

#2 also "works"

Provides three WiFi units upstairs for greater upstairs coverage.
Provides less coverage in the downstairs, where there may be no need for.
Provides three Orbi units that upstairs devices can be wired to.
Provides additional ethernet ports that other upstairs devices can be wired to if there is ethernet wiring to the location where those devices are placed.
Requires addition of an inexpensive, unmanaged gigabit switch (under $40).
BUT, requires a new ethernet installation back to the Altice location.

#3 does not work as shown. The Altice should be connected directly to the Orbi and the Orbi connected to the new switch.

Allows more upstairs devices to be "wired" to the downstairs Orbi, even if they are not in the same room with the Orbi satellites.
But, the downstairs Orbi WiFi may be "wasted" and upstairs coverage may suffer.
Requires addition of an inexpensive, unmanaged gigabit switch. (under $40)

I suggest you start with option #1 and check out the upstairs WiFi coverage. If it is what you need, then you are done.

If upstairs coverage is NOT adequate, then #3 will not be any better, so installing another ethernet cable to the Orbi location is the next step.

Forum Discussion

Poweline PLW1000 funzionamento intermittente