No, you must have a router to use the Base Station.
Unlike other Wyze devices, the Wyze Base Station requires a wired connection to your router. You will not be able to set up and use the Base Station without a router.
Also, you will not be able to set up the Base Station and use it with only a mobile hotspot.
I have a WiFi extender. Can I use that?
If your WiFi extender has an Ethernet port, then yes you can use that to connect to the Base Station. As long as you have that Ethernet port, you'll be able to use the Base Station.