how is a carousel slide defined? what is an example with 2 slides that you make statically? do both slides show at the same time like your example image?
I would think the logic is to count to 12 and then start a new slide for the next 12 but starting at the 13th one using limit and offset.
You could use your if/forloop.index to see if you need to do that, if so then do 2 for loops one with limit 12 and the other offset 13 (or 11and 12 if it is starting at 0).
I can’t say that I have actual experience doing what you want, just going by the docs to guess what could be done.