Making the list CMS with the flipping cards is a no brainer, it’s not more difficult to do than to make it non-cms. So I guess you don’t need help particularly here.
Now adding a bit of chaos into your CMS list, such as you have on your first link, say the first cell is informative, the last one of a block of six too, and there’s a big panel between the first six and the following six… That’s possible but you got to “play” a bit with the system.
To begin with you can split your list into several lists. One list with filtering from item 1 to 6, then static content, then another list with bigger celles (for example) spanning fro item 7 to 9, etc, you can build multiple collections that follow one another and insert content in between.
There are other options, requiring CSS custom code, with pseudo classes and/or pseudo elements that will target one particular item and able to introduce specifity in the design.