Lan port, ONT, TV box, ST router all at top right corner of living room.
If can grab the GT-AX6000 on carousell at good price or TUF-AX4200 seems good for price point.
i am concern if just replace the router outside will be enough to have stronger wifi and speed in room 3 (furthest away). is it possible to hover around 500+ with those router?
or better to get a AX1800/3000 router ethernet backhaul with the ST router outside as AP in room3?
other than the asus routers mentioned, any tp-link router that can compare with those?
1) It is hard to predict wireless performance as it depends on many factors -- you have to try and see if you can achieve that kind of speed. I tend to think it is tough to get 500Mbps in the some areas of Room 3.
2) As a single router, TUF-AX4200 (mid-range WiFI 6 router) will not get the same wireless performance level as GT-AX6000 (high end WiFi 6 router). But TUF-AX4200 is a good value if you need local version. It is the minimum model I will recommend as a main router from Asus. If you do not mind getting China version, then TX-AX6000 (China version of TUF-AX6000) is of superb value (but no local warranty).
TUF-AX4200 (about S$229) in the living room + RT-AX3000P (about S$80 BNIB from Carousell) in Room 3 will be a good combination. Total cost is at about S$309. No need to get GT-AX6000 in that case.
ONT -- TUF-AX4200 main router -- Singtel TV box
TUF-AX4200 -- Ethernet cable -- Room 3 LAN ports -- RT-AX3000P
3) Yes, if there is a budget constraints, you can get TP-Link Archer AX72 (AX5400 rated, about S$80 BNIB from Carousell) as an AP in Room 3. It is one of the best value under S$100 router now. You can try to set up the SSID/Password of the Archer AX72 the same as your Singtel WiFi 6 router. This should usually work well even though the roaming performance may not be the best. In the rare case if it does not work well for some of your devices, then you have to use two different SSIDs.
ONT -- Singtel WiFi 6 router -- Singtel TV box
Singtel WiFI 6 router -- Ethernet cable -- Room 3 LAN ports -- Archer AX72 in AP mode.
4) You can get one unit of Archer AX72 first. Then you can carry out experiment to see how it goes. If Room 3 wireless performance is not as good, you can get one more unit and use EasyMesh. Total cost will be about S$160.
https://www.tp-link.com/sg/support/faq/3529/
https://community.tp-link.com/en/home/forum/topic/593722
ONT -- Archer AX72 main router -- Singtel TV box
Archer AX72 -- Ethernet cable -- Room 3 LAN ports -- Archer AX72 mesh node
5) In summary, if you have budget constraints, I will suggest going with Option 3 first and then Option 4. The wireless performance of Option 4 will be no worse than the more expensive Option 2. Option 2 wins in the Asus firmware feature and long term firmware support. Good thing about TUF-AX4200 is that it will be supported by OpenWRT as well.
https://openwrt.org/toh/views/toh_available_16128_ax-wifi