component constrain plane to centerline or edge

Assembly mode: I have a rectangular part with 2 holes in it. It is angled from the frame at a 30 degree offset. I constrain the rectangular part to the frame with mate/coincident from the back surface of the rectangle part to the face of the frame. I constrain the top surface of the part to the top surface of the frame with an angular offset. I want to add a constraint either to the edge of the component or to a CL of one of the holes to place the part along the frame. I don't want to create a plane in the assembly mode just to align this part. Our assemblies are large and adding planes for every cock eyed part doesn't make sense. Thanks in advance.
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