An another cool method (with my favorite command Line-line :)

Make your circular Array anywhere in normal Plane
Then Use the Transform / Orient / Line-Line (with Scaling none)
(Taking the Center of array as first point, a point of your object on the same plane on the good direction!!!
and a point on the target surface , and the second target point on this same plane of this target suface)

Works of course from any plane to any other plane! ;)

et voilà! ;)



The Helpers lines tools tips text can help you!
Here the "Z negative" vertical Helpers direction on the target surface!


Of course for your case it's trivial because all will be on the same plane! ;)

The power of the Line-line astonishes me at each time! :)