House Type: Condo
Size: 1,200 sq ft
Features required: Stable and fast connection speed
Number of devices connected to WiFi: 5~8 at a time
Internet Speed: 500mbps TIME
Budget: as long as not overkill


Need each sifus opinion here. I'm looking to purchase 2-pack deco x20 for my new condo unit. But have a few thoughts in mind:

1. To have 1 unit replace as router, with another unit installed at the corridor through wireless backhaul
2. To have 1 unit replace as router, with another unit in master bedroom plugged to the repeat point (RJ 45 outlet)
3. To purchase 2 routers (say Asus RT-AX55), and create an AIMesh system (1 at living room, 1 at master bedroom).
4. Just have 1 crazy good router at living room (suggestions needed for this).

Which options look to be the best? Layout attached.

https://pictr.com/images/2021/03/02/7KsPJq.md.png