How do we position hands together when we pray (合掌)?

Venerable Ru Jun demonstrates how to put our hands together when we pray.

(from 0:00 min to 0:47min mark)

Venerable is showing the hand positions based on the Teachings he has received.
My understanding is that there can be differences from other Teachings - the importance for me is the respect we are showing to the Three Gems each time we pray.