There shouldn't be anything complicated for adapting this to IS Boxer.



In Warcraft, set a keybinding for 'Interact with Mouseover'.

Make a mapped key, that sends IwM (Interact with Mouseover) to all windows.
Or maybe to all members of an Action Target Group, if you want only some characters to IwM.
Any hotkey that is unique, but the output has to be your wow IwM keybind.

In IS Boxer, make a 'Stack Up' mapped key.
Something that will move the slaves forward (W key, Target: Window All w/o Current)... and the master backwards (S key, Target: Current Window).
Probably 'Hold Keystroke while Key is Held', so you can... Follow, to line them up > Press & Hold this mapped key's hotkey > Release and have everyone stacked up nicely.
You can have this send a keybind for SetView, or use a Named Macro Library Action, with the SetView macro stored in IS Boxer.

Then you either need Mouse Broadcasting enabled or a Repeater Region that is large enough to cover the area in which you'd like to click.
The Broadcasting is probably easier.



In practice...

Everyone is following the current window.
You position your main near where you'll want to IwM.
You push your Stack Up hotkey, and release when they're stacked... that sets the view so everyone has the same camera angles etc.
Enable Mouse Broadcasting.
Push your IwM hotkey, once the mouse is positioned where you want it (don't click with the mouse, use the IwM mapped key).