Currently The image-hover addon only works with links,
In order to create the same effect with a custom Class or ID you would need to implement some JS/jQuery,
That on 'hover' an 'Opacity: 0' image is given 'Opacity :1,' - a class would be added to an image/div that adds these CSS properties,
You may need to seek the aid of a developer if necessary.
I Apologise if this is a large inconvenience for you at this time, however i will add this to our development notes for future discussion and reference.
I don't answer or check forum DMs, please just post on the forum.