Can jmd. Help WLAN etc?

Co
5

In a house with 3 floors, a WLAN should be set up, but there's a lot of "steel" in the walls and there's no network socket on the 2nd floor.

Develop a concept so that all floors are provided with WLAN and also note down the specific security measures for a PC, 2 notebooks, 2 tablets and 4 smartphones.
I don't need help chekc.

Gr

D LAN would be an option

Wo

Fritz! Place the box on the first floor, possibly install a repeater above and below and set up a firewall. Fritz! Encrypt the box according to WPS2. Possibly. Make network invisible.

ja

Router at the bottom of the tel can.
then put an access point per lan on each floor which can use Wi-Fi.
Security measures can be installed on any computer.

Co

Take yours because I would write it like this if I knew it.

Si