In my experience, even when the behaviour improves & the adjustment period starts to end when the child settles in, the willingness of the parents to work with you won’t really change. So just keep that in mind when making your decision. Everyone is different & some providers may be ok with tolerating certain things that others wouldn’t, but I myself wouldn’t want to work with a family that wasn’t willing to work with me, no matter how well behaved the child was. The foundation begins there, if parents & provider are all on the same page it makes things generally way easier.