So let's say I deliberately fall let's say 20 feet, I will take 2d6 points of damage. As a monk at 4th level I get slow fall which will let me nullify fall damage 5× monk level. So at 4th level, I get 20 nullification. So even under the scenario when the die maxes out which would be 12, so I fall prone when I land?
The rules in this case say:
A fall from a great height is one of the most common hazards facing an adventurer. At the end of a fall, a creature takes 1d6 bludgeoning damage for every 10 feet it fell, to a maximum of 20d6. The creature lands prone unless it avoids taking damage from the fall.
— Player's Handbook, p. 183
So do I fall prone or no?