Yes, that's no problem, but I wouldn't recommend trying to optimise a WLAN with a range extender. That is not optimal. It would be better to invest in a WLAN mesh system and switch off the WLAN in the router. A range extender can't serve devices if they still have a connection, albeit a poor one, at the main router. Only when the main router connection drops completely and you are close to the extender, only then would the range extender take over. A Mesh WLAN, on the other hand, will pass the devices from one Mesh WLAN router to the other without interruption.

I would recommend the X20 WLAN Mesh System from TP-Link, it can handle WiFi 6 and covers a very large area. This solution can also use over 100 devices without any problems.

https://www.digitec.ch/search