As JF has said, I adopted this strategy on supports that seemed "risky" going to two angles and it helped a lot. You can look at the print and see what would be the best angle compared to what is going to print on top of the support. In other words, if you have a big area that will print on top of a support then you can adjust the angle of the support so the "bridge" or what is printing on top doesn't print parallel to the supports.