I am sure someone will be able to help you with this during mango season. Ask again around May. Also, ever considered buying grafted trees?

Any particular kind? And are you planning on grafting them?

If you're in Phx AZ, there used to be a nursery out on Baseline Rd somewhere that had lots of tropical plants and lots of Mango trees. Tropica Mango Nursery is the current name I think it used to be called something else but can't think of it right now.
Here's a link

Here is a link that might be useful: Tropica Mango

and....PhoenixPlantAddict....if you've been around here enough to see some of the posts and pictures of winter's power to damage, being in Zone 9 you must be prepared to protect those mangos from freezing and sub-freezing fronts that move through a few times each winter.....that will be a very important part of developing an established orchard in your back yard...I know I'm just painfully learning how to hope for the best but prepare for the worst.....

MangoDogBone