I just ordered seems a nice price. Compare to RBK50 this is smaller coverage and fewer ports but good for my small house.
https://www.netgear.com.au/orbi/rbk20.aspx
Tech Specs
Combined WiFi speed 2.2Gbps (866+866+400Mbps)†
Coverage 280 m sq
Dedicated Backhaul 2x2 (5GHz)
WiFi Technology Tri-band
MU-MIMO Yes
Antennas Four (4) high performance internal antennas (each)
Dimensions 5.6 x 2.4 x 6.6 in (Router), 5.6 x 2.4 x 6.6 in (Satellite)
Weight 1.05 lb (Router), 1.05 lb (Satellite)
Gigabit Ethernet Ports 1 WAN and 1 LAN
Memory Router: 256MB Flash and 512MB RAM
Satellite: 256MB Flash and 512MB RAM
Beamforming Yes
Works with Orbi OS Yes
Orbi App Yes
Guest WiFi network Yes
WPA/PSK2 support Yes
Works with Amazon Alexa & the Google Assistant Yes
Is this suitable for a townhouse?