I got tissue culture plants here in Thailand from a certified Sumalee farm, aged about 8 months, and sexed, so I only needed to plant 2 palms.
In Thailand Sala Indo is here, but not sure what strain it is, I don't think it is self pollinating. For sure Sumalee needs not just male and female, but you need to assist pollination from collecting male pollen and dusting the female ones. Otherwise the pollination rate is very low.
Sumalee doesn't like full sun, but are more tolerant to wet feet then I think commonly believed. I planted 2 in flood zones that killed many previous trees beforehand due to rot, and they pushed through. Now my second tree is suffering because I harvested sugarcane that was shading it. They do not like full sun, or even half sun, filtered sun is best. It is starting to turn yellow, a bit of leaf burn. I have to dig it up anyways since I'm digging a fishpond there, so no problem.
They are definitely I think one of the top 10 understory tree choices for any agroforestry project. They are often planted in the rubber plantations between rows, however in that case they need irrigation during the dry season.