Would have to be in a greenhouse in the winter. Even her in San Antonio we get freezes

The mango is a truly tropical tree. Temperatures should never fall below 40ºF. It's also a large tree with a taproot. Ideally, you would plant it in full sun, then build a greenhouse around it. Sorry, but only in the Valley would this plant not need a greenhouse. You can, however, grow it in a very large, deep pot and prune it back like a bonsai. Grow lights are helpful in the house to produce fruit during the winter. HERE and HERE are links to info on growing mangoes.