Yes, the repeater is also compatible with other routers, but I would not recommend it, because the equipment is only single band and can only use outdated WiFi 5, which is quite modest for the horrendously high price. For very good WiFi reception, WiFi mesh technology is used today. One of the best WiFi mesh routers is the Xiaomi AX3000 router, which is also very inexpensive but not cheap. With a mesh WiFi set, you get the much better and expandable mesh technology, as the devices connect automatically and without interruption to the respective WiFi mesh router with the strongest transmission.

In general: Repeaters are no longer up to date, they are not a good solution for perfect WLAN coverage.

The Xiaomi set consists of two identical routers, can manage up to 256 devices, has a built-in 3 port Gbit switch and also has modern WiFi 6.

Xiaomi AX3000

I don't know, but I have connected it to a Swisscom router. It may be possible to do it manually without WPS.