Did you hear of room lists? What is a room list?
A room list is a collection of room mailboxes. Room lists are specially marked distribution groups that you can also use the same way you use ‘regul...
Updated May 21, 2020
Version 5.0
Blog Post
Harald_Steindl At the moment it seems Room Lists can't span multiple cities. We have the same problem where we wanted to use the workspace functionality for a department that is in multiple locations. It would probably be better if The_Exchange_Team were to add mechanisms to change what filter options you want to as the area filter (City, County, Country, Room Lists, etc).
To workaround the way the city filter works we are putting the county in the city field where sites are split but people are likely to search for any of the sites. This then groups the room lists in the new Room Finder for a better user experience. The problem with workarounds is MS might change the functionality and tell you its your fault for putting counties in city fields 
The Room Lists for "capabilities" can be replaced by the new Video/Display/Audio/Custom tags though. We did a little work to move resources that used to be in a "Video Conference Rooms" list into our main meeting room list with "Microsoft Teams Room" custom tag using the Set-Place -Tags powershell command. Once users are educated on the tag filter it seems to be relatively intuitive compared to separate lists.