The position you can achieve will be impacted by both the bar shape and the levers that you use.
The more modern levers do not necessarily play well with the traditional shaped bars.
I try to keep the transition between bar tp and lever as smooth/level as possible, but this is usually a balancing act to keep my bar ends parallel with the ground

Campagnolo Record 11 speed on 3T Rotundo



Campagnolo Record 10 speed on Cinelli Campione del Mondo