On any listing (Monitors, Media, etc), you can click on the column titles and change the sort order. So, you could rename the devices, e.g.:
1st Floor – X Monitor
1st Floor – Y Monitor
2nd Floor – Z Monitor
….
and then you can just sort by the Name column. Note that this sorting is not saved across sessions.
We are indeed planning for a better way to organize entities, in order to provide per-item access rights, so a folder-like structure might be implemented. This remains to be seen.
For replacing a Raspberry Pi, you can just use the new Registration Code. It should work. If it does not, reach out and we will help you out.
I am setting this idea as “Declined” just to indicate that we won’t be implementing what you described, and that we will likely cover this requirement in a different way.