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

1. Add two more holes to the object to meet the requirement of having three holes. 
2. Ensure that these holes are aligned with the smaller side of the rectangle. This can be achieved by placing the holes in a straight line parallel to the shorter edge of the rectangle. 
3. Maintain the location of the holes towards one side of the object, as this aspect is already correct.