If you were to go through the configuration options for each addon.
With one account only.
And set it as you like it.

Which might require to start from the default, stock and unconfigured settings.
Just so you are sure every option and box is in the exact same position/setting across all toons, at the start.

The catch -- do the configuration with mouse and keyboard repeaters on.
So any change you make to one, is done to the others at the same time.