What exactly triggers a row enhance awakening?

The row enhance awakening says it gives a 10% damage boost when you match a row of 6 orbs of its color.

1. Do the orbs really have to be in a row? What if I match 6 orbs of its color in an L-shape, or in a 2x3 block?
2. Assuming they don't have to be in a row, does it have to be exactly 6 orbs, or will any match of 6+ orbs work?
3. What if The whole board is that color so I clear it all in a single match, e.g. by using Raphael then any heartbreaker? Will that trigger row enhances 0 times (since the match was >6 orbs), 1 time (for 1 match), or 5 times (for 5 rows)?