PdfRenderedRectangleQuadPoints Property

The four corners of the rendered area as they appear after any rotation has been applied, expressed in points and relative to the top-left corner of the page or template. The corners follow the original orientation of the element: TopLeft is the corner that was top-left before rotation, and so on. Use this property to draw connecting lines or annotations that follow the rotation of the element instead of an axis-aligned bounding box

public PdfQuadF QuadPoints { get; set; }