You're opening a can of worms here, novita.
At least the waitress can earn tips if the patrons have any sense.
Anyone with a live-in maid should always occasionally give them a bonus, do something special for her on her birthday and religious occasions and consider giving her an anuual raise.
And don't work them to the ground!

As for the agencies, why should be any better than all these companies. Mistreating employees is an unfortunate art that's almost perfected in these parts. And I don't mean just Qatar.