I think you may want to perform sizing prior to spawning an actor. Don’t think in “visual” objects at all times. You can have data objects that represent the information you are speaking of, set that, then calculate the spawn pt for the graphics actor. Does that make sense?
Or, if you’re stuck with the spawning of an actor and need to determine the size afterward, just make the actor invisible until you do with it what you need to, then make it visible.