R Schachter’s psak is on yutorah.org. I’m just reporting it, not saying you have to follow it.
For what it’s worth, I disagree with his psak about saying Hallel after Maariv on the seder nights. He paskens that even those who usually say it should not do so when davening biy’chidus, or even when davening with a home minyan all of whom will be at the seder. It seems to me otherwise, and I will be saying it, even though it looks like I will be completely alone both for maariv and for the sedorim.