A grid of squares with different CPT in each

Hello,
I am already your WP File Download customer and I would like to purchase the complete bundle. I need a functionality that I think WP Latest Post can give me. I would like to make a grid of squares at the end of a product sheet that would highlight elements of my choice of several Custom Post Types, selecting Taxonomy and Post in each square. That is, a group of featured elements of different Custom Post Types.

In the video I have seen that in the "Content Source" section you can choose a Custom Post "Choose a custom post type" and a taxonomy "Choose a taxonomy (optional)", but I don't see the option to "Choose a post". Is it not possible to select a post? Does one come out randomly from that CTP and Taxonomy?

I use the Divi theme and Toolset.

Thank you so much!