Find Center of View Crop

Looking to find the center of all view crops and their size but that part I think I’ve got, in order to place a Generic Annotation.

It seems that the origin, and, therefore, I think the bounding box of the crop, are different for varying view types. And some of these depend on which way the view is looking, not to mention if it’s at an angle!

How would you approach this?

This post has been her for a while but not solved yet.
Like this it works for me.
I take the TopLeft and BottomRight corners of the crop. Get the vector between them. Place a line from TopLeft in the direction of the vector with half the length. There is your midpoint.