So, for example Instead of having 2 "places" to connect to practically only one that automatically switches when you are closer to router A, you have better connection but the same thing with router B, without the device connecting (eg mobile phone, laptop, …) has to change or router B would have to establish a new connection.
Arrives on the router. Some can be used as repeaters, as exactly what you want. Whether this is possible with your routers, no idea, look into the manual, google.
That's exactly what repeaters do!
By the way, if the device was already logged in, it automatically switches to the stronger network.
For both routers, set the same SSID and Wi-Fi password (but different Wi-Fi channels). If possible 2nd router configured as an access point, if that is not synonymous as a repeater is possible.
Then the WLAN client (smartphone, laptop) will automatically switch the WLAN access point automatically. Whether and when the WLAN client changes is up to the WLAN client itself. Some clients only switch if the connection threatens to break down.
Better with mesh systems or band steering:
Here explains:
PS:
How good or bad that works is often a question of money. Mesh only works with the devices of a manufacturer, i. Is router and repeater / access point from a manufacturer and support this mesh, it will work. This luxury problem can be solved by using more money.
Yes, but I would like to use Powerline to avoid laying cables, but I would like to achieve exactly the Repeaterereffekt with Powerline.