We are using the Minoura telescopic double bike stand. I like that the ends are pushing against the floor and the ceiling to hold the pole up. Very easy to move around and doesn't mark anything. Would work on carpet (maybe put a hard tile down underneath it).
We had an earthquake recently which I felt (bed shook but nothing fell down) and it worked fine. In fact we had the tandem hanging vertically on a wall hook and along with the bed moving, the swaying tandem was what clued me in that we were having an earthquake. However the epi centre was quite a few 100s km away. A direct hit- I think hanging bikes might be the least of your worries!