I have managed to get through to MPO, and I have waitlisted for the 2 flights. So I have answered my own question
FYI For those who do not know, you can waitlist for up to 3 flights. I think that is pretty good that you can do that.
I wonder if we should have an FAQ regarding flight rewards with CX. I know recently I have been looking for lots of answers, and there are often rewards related questions on this forum.