A. Támarah and A. Rigidus are cross pollination types.
But for mostly artocarpus trees you need to have minimum 3 trees to have fruit full with flash, and better from different batch of seeds.
But best to have 4 plants.
If you have one tree - you will run to issue missing flash.
If you plant 3 plant them in triangular pattern, with one tree facing do dominant direction of wind, like this at list this one will cross pollinate other 2
Same with pattern for two trees in line with dominant wind direction