In the nursery trade, Mango is grafted to the central leader of 3’ - 4’ saplings at about 32" above the soil. A banana graft or similar is used. The grafting is usually performed in the late Spring / early Summer growth flush. Branches on the saplings below the graft are left on the plants until at least 18" of vigorous growth develops above the graft. The most common rootstock saplings in the U.S. are Manilla - which are available in bundles from production nursery and orchard suppliers. This “Manilla” has nothing to do with the large mango fruits sold in Manilla, PH. Note that Home Depot / Lowes shamelessly buy these and sell them as fruit trees.