I have a Nam Doc Mai mango that was growing in a container and fruited for me.  It is now planted in the ground inside the greenhouse.
I'm glad you had a good experience with the "mango man".  I tried ordering from him several years ago and received nothing but a run around.  Needless to say, I did not place an order then or since.  I don't think you can go wrong with PI.  Good luck with your new plants.