Cross your fingers Mark , I planted 2 at sealevel in 2 friends places , one each , I used to have 2 trees at my orchard , 4 - 5 meters tall that died one after the other for unknown reason .
The trees at my friends places do very well , gorgeous and enormous trees , lots and lots of flowering but only a few fruits after several years of flowering and no fruit set . So I agree with Oscar , they could use a companion ...