Here's the official responses from D-Link support:
> > To add an additional COVR units to an existing COVR network, you can use the WPS buttons on the devices. The WPS will be the small button with the 2 arrows in a circle. Plug in a new COVR unit and wait for the light to go to the flashing yellow amber. Press the WPS button on the COVR unit for 2-3 seconds (light will start to flashing white). Press the WPS button on one of the existing COVR units on the network for 2-3 seconds. It will start to flash white as well. The devices will take approximately 2 minutes to complete the connection. They should both return to solid white indicating they are connected to the same network.
>
> > If the new device goes back to flashing amber/yellow, it wasn't able to connect. You can try the WPS buttons again. Possible causes for the connection to fail may be the firmware version on the new COVR devices is significantly older. You may need to set the new COVR units up as a router, upgrade the firmware, and reset the new units back to factory defaults and proceed with the WPS buttons again.
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> Thanks for the information. I think that procedure assumes wireless connectivity. (using the WPS feature)
>
> I am using the COVR-C1213 devices using wired backhaul. Please advise in that case.
>
> Also it is still unclear to me -- I am looking for central management of ALL COVR units -- so if the 2nd pack's COVRA is running its own "management/interface" -- will it relinquish control to the 1st pack's COVRA?
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> Adding the devices via wired backhaul will be even simpler. You will simply need to connect the COVR units to the network via ethernet connection. Power them on, and wait for 5 minutes. If the devices haven't been configured, they will be detected by the existing system and automatically added. If the new COVR devices were previously configured, you would need to reset them back to factory default before connecting them to the existing network.
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thanks! and all the new COVR units will be managed by my original main COVR A?
Yes. The unit acting as the central management unit will acquire access to the new COVR devices.