Here is the problem we are facing:
The ParallaxItem only changes the visual presentation of a component (since it’s normally just used for moving backgrounds etc.), it doesn’t affect the logical position of the QML containers such as the entity or the collider (needed for collision detection when placing). This means the entities actual position will be different than it’s visual presentation when moving. Your 2nd layer (without parallax effect anyway) is of course no problem, but i fear it won’t be possible to place such draggable parallax entities on your 3rd layer.
May i ask you what kind of objects would be in the 3rd layer?