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 means they should be arranged in a straight line parallel to the shorter side of the rectangular object.
3. The holes should be located towards one side of the object, similar to the existing hole.