Can the housewarming couplets be posted in advance?

Which housewarming couplets do you think were not posted in advance? Or put up couplets after moving in?

Who is waiting for things (including furniture) to move into the door, stop the porters, put up couplets now, and then let them in when they are finished?

Your question is only a matter of how early it is appropriate.

Because it is easy to fade and break ahead of time, it gives people the impression that it is an old couplet, so as long as it can make people feel the joy of moving, it is a new couplet.

Generally, one day in advance is appropriate. But this is by no means a necessary condition, nor is it an old rule.