Hola Amiga Miranda @cintiamiranda21 , Que lindo nombre por cierto!! 
You are doing everything right, you just made a “debutant” mistake, who controls the height with respect to the level is the parameter: Elevation from Level and not the Z value of the point directly, you can also use the node FamilyInstanse.ByPoint, to use the Z value directly but in this case the families will not be associated with any level, simply exist and will be visible in the project, I hope this helps you!
