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In order to resemble vanilla spawn conditions, the mob_rooms feature places the mob_room structure at around y-level 0 that scans up 100 y-levels up from there along with scanning around within a xz radius.
Once a placement has been found to have suitable spawn conditions, it is then checked to see if the the floor and ceiling of where the mob_room will be placed is solid or not.
If the floor and ceiling check fails due to not being solid then it moves on to find another suitable location.
This allows for only 1 instance of the mob_room to spawn in a particular area without any stacked instances along with resembling vanilla spawn conditions.