I think something like this would be great. Just adding folders is probably not the most difficult thing so I'm going to scope creep the hell out of this simple request and say it would be nice if the grouping were more meaningful. Potentially even giving you the opportunity to view multiple racks at the same time.
I think adding this part to the request makes it a much more complex UX problem, but I'm sure a lot of people have multiple cases and it would be nice to have an easy way to see which modules are being used where. I can sometimes accomplish this by making one MEGA rack, but that's getting harder to do since I have 84, 89, and 104 width racks.
Having an option to group rack in the command center and view them all at once would be nice, but I think adding an option to share modules across a group would be nice. Maybe you can make a folder in Command Center and select "logical" or "real" where "real" will show module counts across the whole folder and "logical" just groups them for organizational purposes.
Even if that is just too much to make work cleanly, I still like the idea of just folders for grouping. I like to keep some record of historical setups from time to time. It would be nice to have a "2025 summer/fall" folder and "2026 winter/spring" folder.