What I want to do is create multiple copies of the module so that the main content of a page is composed entirely of image links that go to separate articles. I want those image links to default to a grid layout determined by the body width.
So, for example, right now I can create 6 image link modules, but if I assign them to the custom position "embed," they simply appear vertically, all in one straight line down the page. I can get the grid layout (2 columns) but only by assigning every other module to the content position "contenttop-a" and "contenttop-b" respectively and that's not going to work well.
I've attached screencaps. The first (exa.jpg) is how the modules look with a custom position. The second is how they look using alternating a and b positions. What I want is to use a single custom position (i.e. "embed"

Where in the code can I adjust these settings and get the needed effect? Thanks!