If I were in that position, I'd secure the room broom, unloaded in a locked Plano, Pelican or Dockosil gun case.
When I was in the home or apt for a bit, I'd load a few tactical or LE 12ga rounds and keep it "crusier ready". I'd put it back in the gun case or maybe a VooDoo Tactical shotgun scabbard(if no kids or untrained adults lived there too). For extra security I might add a cable lock or TSA type security lock also.
I don't advise using a 12ga for general defense but if I had one, I would take those measures.
Safety & theft or loss would be the big issues.
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