For me, I will tuck in one child first, then followed by another child. It is quite hard to just let them to fall asleep alone in the room by themselves. 2 years is still quite young to understand not to make noise and keep herself in the bed.
My daugther sleeps at 7pm. Once she sleeps I will let her brother sleeps at 8pm. Both of them wake up at the same timings in the morning.