Hello. I am going to live in a 3-floor home and I would like to build the connectivity using OneMesh devices. The home has a floor we name 0 with the living room and a terrace, then a lower floor we name -1 with 3 bedrooms, a studio and a garden and a floor we name -2 that is a sort of basement with a cellar and and additional living room used for home cinema and parties.The connectivity needs are smart working, home cinema, parallel video and audio streaming, remote control, home automation, IoT,  video surveillance

This is the project I would like to build:

1) A server cabinet in floor -2, where the optical fiber 2.5GB/s is connected to a proprietary modem of the service provider

2) The FTTH modem is connected to a TP-LINK performant OneMesh device, I am considering the AX90: any suggestion?

3) The router is connected by LAN cat-6 cables to 2 switches like TL-SG105-M2, one for floor -1, one for floor 0.

4) I considered 4 extenders: one for floor -2, two for floor -1 (one internal, one for the garden under the  porch), one for floor 0. What is not clear are the performance of the router's and extender's antennas across 2 floors.

5) The extenders should be RE605X connected to the router using a dedicated LAN cat-6 cable from the switch in the floor: could anyone confirm the LAN por in RE605X can be used to connect the extender to the router and it works if the connection is distributed by a switch?

Can I manage a guest network and distribute it by the same extenders of the main SSID?

Any suggestion, inprovement?

Thanks.

Emanuele