i built a browse page that displays several category headers, each with a varying amount of article thumbnails underneath (displayed 3 per row). i want the category headers to rigidly separate the content, but the article thumbnails keep moving up to fill in the empty slots that result when a category does not have a multiple of 3. i've tried adding blank placeholder banners, but i can only use them once per collection. this is driving me nuts as it seems such an obvious functionality. am i missing something?
i don't want to use an article to accomplish this as it would not utilize the AEMM features i'm after (dynamically generated layouts and collections)