@rethy
Unfortunately, no such information can be found on the TP-Link websites at the moment. I would recommend you email technical support directly and provide more details of your house to get a proper suggestion, such as the size, number of floors, wall material (e.g. concrete and steel structure, wooden walls, plasterboard.), etc.
The Tapo hub and its sub-devices are connected using TP-Link SubG technology, which means that SubG devices can be placed further away from the router than regular 2.4GHz WiFi devices. You can get a better idea of how these devices connect from the image below.
TP-Link Sub-GHz Technology Brings the New Tapo Lineup of Smart Hub, Sensors,Switches and More.
