This modules uses the built in Display Modes possibility in Drupal 8.
In the structure menu you can set a new display mode. I made small teaser. Yust a name...
Now this mode can be used in every content type.
This mode you can use in a view. The Split mode format allows you to change the mode, for the first showed items. You see that i chose teaser as default..
For the first 2 items i take the new made small teaser.
The result. Mind the difference between the first 2 items and the other ones.. Put some CSS on it (i did not..)