I configured a WDS link between an RV120W and a RV220W.
Worked just fine.
Requirement would be to see immediately if the devices 'see' each other. If the WDS link is operational.
Better even with a signal quality indicator of the WDS link to allow positioning of the devices in the facilities.
For installations this is a must otherwise it is trial and error and a very lengthy process.
If both devices are on the LAN for configuration you have to enable STP. If STP kicks in you might get disconnected for a short period.
If one device is already at the remote location and it does not work immediately you walk around with your PC for troubleshooting check one side, than check the other side etc.
If you had a reliable indicatioin of the WDS status you would not need to to that.
WDS to a AP541N did not work. Not that I expected that."