I’m thinking of buying the GL-X750V2 and use the repeater mode when possible and 4G-modem when no wifi exists. However, is it possible to have a unique SSID that always applies to both these options? Or will the WIFI SSID of the GL-X750V2 be the same as the WIFI that I connect to in repeater mode?
If I understand your question correctly, the wifi SSIDs for LAN can be assigned separately from the repeater wifi SSID for WAN and will not change on failover from wifi to 4G.
I do not work for and I do not have formal association with GL.iNet
X750 has its own SSID and will not use the same as the network you are repeating, unless you change them the same.