My LBS installed a Topeak MTX Explorer rear rack on my 2019 Como 5.0 prior to delivery. This includes a sliding track mount for a Topeak trunk bag. Been very happy with it. Topeak makes a ton of Explorer variants (disc brakes or not, spring or not, etc.) I believe this is close: Topeak MTX Explorer.
These photos show it mounted on both the small frame low-entry model, and the M/L size standard frame. Hard to see in these pics, but the main support arms mount on the inside of the rear triangle, making a very clean install. They have a nice clearance between the tire and the rack which leaves plenty of room for the arms on my 1UpUSA rack.