[Question] Create space where component would drop

As mentioned in the title (which may be a bit confusing), I'm curious about how to create a space where component would drop. This is very common in implementations of dragging/sorting I've seen. (eg. https://shopify.github.io/draggable/ and jQuery Sortable)

From what I understand of the drop placeholder (green bar in attachment), it's in a separate "Layer" and actually lives outside the canvas. I want to implement a better drop placeholder, I'm just not sure where to start when implementing this.

I have a similar request open regarding the DRAG placeholder, however, I'm speaking about the DROP placeholder in this issue.

The following code doesn't return what I would expect either...

editor.on('sorter:drag:start', (src, srcModel) => {
	console.log( 'src: ', src );
	console.log( 'srcModel: ', srcModel );
})