Yes, the parts are good in this area. To answer the question specifically, they can be operated in client mode (cf. 4.1 in
https://www.zyxel.ch/de...). If an access point is already available, only one of these devices would have to be purchased.
However, I do not want to hide the fact that I am not very satisfied with the two APs of this series that I have been using for a year. Because of disconnections and the non-switching clients in the network, I will replace them tomorrow with Ubiquiti UniFi AP AC-PRO.