I use a modified tripod stance (shoulder width) with my empty hand braced on dumbell rack or bench and feet staggered a little. If I'm rowing with my right hand I place my right foot about 1ft further back. I pull to my hip and tap the floor on the stretch just to make sure I'm not shortstroking.
I've noticed pulling high(armpit area) like I see a lot of guys do seems to work more rear delt, traps, rhomboids on me and that's why I pull to my hip... in a arc. Pulling yo my hip seems to hit my lats down low.
I switch it up from the low to high version to keep it interesting though.
To me that knee just looks like a extremely developed "teardrop" at angle that exagerates it appearance.