The advantage of mechanical servants is that they can all be interconnected, forming a vast network.
If more than ten thousand mechanical servants were dispersed throughout the world, they could cover the entire world with the mechanical servants network, thus establishing a highly developed information network.
Since Renji crossed over, he hasn't established his own power. He can't always rely on his wives, and these mechanical maids that belong only to him are an opportunity.
[So, Master Ashen, are you planning to use them to establish a global organization?]
[Forgive my bluntness Master, but if you want to rule the world again, there are simpler and more convenient ways, such as the 19,752 nuclear warheads stored in the Mechanical Alliance]