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Hmmm not sure how we would determine where, which back drop would move...

I think current todo solution for this is to remove backgroup ability to move nodes that are above it. So you can freely move backdrops without moving content.

It will be an option you can set in backdrop preferences. This way you can re-arrange them later.

Update to this. You can use Text Node + background opacity set to 1 to simulate backdrop experience now without it moving content nodes above it.
As to arranging them, sadly no way to do it as we don't know which node the backdrop should follow.
Unless we make assumption that we follow each node in its "child" list, or we re-adjust the backdrop to resize/match to its child content, or just reposition based on 1st node in child list? Its a bit... tricky to decide what should happen and when.