Answer: Handlebar sweep and roll are highly dependent on personal preference. There is not a "correct postion" or "incorrect position".
Also, bicycle head tube angle will impact the roll requirement to achieve a "neutral" bar position for a given bar. This means marks on the bar indicating specific roll/sweep positions assume a specific head tube angle for them to be true. With modern headtube angles on bikes varying 5 degrees or more, there can be some notable differences between bikes which is why we don't explicitly state these numbers on our handlebars.