WordPress divide my post

Hi,
i was wondering if this is feasible.

Supposing my i want to divide my post … Lets say, i have all my post side by side in 2 rows.

Lets say a total of 8 from the category (Mypost)

Now assuming, i want to have a static <div></div> between the first 2 rows and the rest of the columns below, is this feasible?

Also assuming i want latest post to show on the 2 up rows and the old post to move below my div.

I have tried , but did not come out with any feasible solution.

Great if someone could be able to assist. I have content.php where all my contents are being generated and index.php being the front end.

Thank you