Based on the answers provided, the following corrections need to be made to the 3D object:

1. Add a third circular hole to the rectangular plate. The size of this hole should be smaller than the rectangle, similar to the existing holes.

2. Realign the circular holes so that they are symmetrically aligned along both the length and the width of the rectangle. They should be equidistant from the sides and the ends of the rectangle.

3. Position the circular holes near the top left corner of the rectangle. Ensure that the alignment is such that the holes are closer to the top left corner without compromising the symmetry.