rotating a game object relevant to the face it on, on another game object

rotating a game object relevant to the face it on, on another game object

I'm working on a game in which you place things on a asteroid, which for right now is represented by a cube, although I'm starting to wonder if a sphere would be a better chose right now. Anyway I attempted to set the rotation of the game object by figuring out it point in relations to the object it being place on with an inverse transform point but for whatever reason either the if statements stop working or something inside of it stop working, is there something I'm missing here or is there just a better way of doing this.?

                        var relatePoint = ghost.transform.InverseTransformPoint(BuilderHit[i].collider.gameObject.transform.position);
                         Debug.Log(relatePoint);
                         //Debug.Log("inside dwarf asteroid");
                         #region zside
                         if (relatePoint.z == 200 || relatePoint.z == -200)
                         {
                             if (relatePoint.x < 150 && relatePoint.x > -150 && 
                                 relatePoint.y < 165 && relatePoint.y > -165)
                             {
                                 Debug.Log("Can place");
                                 ghost.transform.rotation = Quaternion.Euler(0, 0, 0);
                             }
                         }
                         #endregion/**/
                         #region yside
                         if (relatePoint.x == 200 || relatePoint.x == -200)
                         {
                                 Debug.Log("Can place");
                                 ghost.transform.rotation = Quaternion.Euler(0, 90, 0);
                         }