We know that family can be inserted into a project, sometimes we want to specify a special point when we insert the family. We can pass the point (XYZ) as the first parameter of FamilyInstanceCreationData when call Document::NewFamilyInstances.

However, how can you know whether the insertion point is the right place you input? You can call FamilyInstance::Location to get the insertion point, but in Revit, you can use following method to know what exactly the insertion point is:

Add two perpendicular module lines in a plan view, drag a family into the view and move the mouse until two model lines are highlighted, click mouse to put down the family. The cross point of the two lines is the insertion point of this family. You can know the coordinate through “Manage” tab -> “Project Location” panel -> Coordinates -> Report Shared Coordinates.