Extender vs WDS mode... wifi to ethernet


I have a device that only has ethernet connection. I was hoping to use my old GL AR300M to connect to my router’s wifi connection - and then use the LAN port to connect my device. My device needs to be able to see devices that are connected on my main router.

Is this Extender or WDS mode? Or should i just go with WISP, and disable the wifi broadcast out of the AR300M?

I’ve been trying WDS all day to no avail.

Extender mode and disable wifi. Will not create new subnet.