Helper or in law??

I have a 2yo toddler & and upcoming baby soon in Oct. And both my husband and I work shifts. Initially we decided to put our baby in ifc but then it's difficult to juggle esp when one gotta rush from work to fetch by 7pm. So we have decided to engage a helper. We won't allow her to use phone and will have cams in the house. Also, training her on the chores. Most imptly, must let her know we are firm. Work is work and they come here to work. I tho prefer those that have not come SG so they don't have friend connections. At least they'll behave. I think when they come over, ground rules must be laid.