Fix height (Perfect grid, no masonry)

Hello,

We bought your filter and we are quite satisfied with its efficiency. My issue is that I wish to disable masonry, which means I want a perfect grid with a perfect alignment. (3 in a row for a total of 5 posts now)

My thanks;

PS : I tried CSS yet results were not appealing, gaps are still taken in consideration and images are also cropped
PPS : Is there an image resolution / size you recommend as to show it entirely when browser zoom is 100%