Orbi router

I have an extra RBR850 thawas part of my new WiFi 6 system because I needed an extra satellit and Best Buy only had the boxed systems.

Can it be use in my Mesh network as a satellite? I currently have two satellites on my Orbi Tri-band Mesh.

I could connect it via an ether net cable about 200 feet away in the basement.

Just seems like I should be able to use it. Suggestions please and if so how to plug it up.