Thanks for your suggestions.
The first one would leave the 3 male maids in the neighborhood, creating a 4th female maid which is nice but look a hassle to do, I will need to end service and switch maid each time to befriend another one with the same household.
Then what is the better easy and quick cheaty way to befriend a maid? Option in the tomb of L/D maybe? I never did that before.
Second option to put them away seems straight forward but I dunno what I will do with them, if I want to delete them I feel very anxious on game corruption, they were npc, should know many of my Sims...