Geometry Constraint

Before I test this, is it possible to use multiple geometry constraints?  Such as one constraint for a large water body and a second constraint for the Bridge over the water body.  These would be overlapping constraints and I am curious as to how the software will react.  In the area of the overlapping constraints will CC use the Lowest Z value, Highest Z value, be load order dependent, something else, or just crash.

My interpretation of the help manual is that when an area or location in the reconstruction is of sufficiently low confidence then the geometry constraint is queried for the elevation value at that location.  We the users, need the option to determine what a sufficiently low confidence value is.  Maybe this would be a Low-level setting?