It depends on your ambient house temperature. If I remember correctly coconut oil is liquid at about 74 or 76 degrees F. Other ingredients will change that, though it is hard to tell exactly how. Would you be able to keep your fat bombs in a cooler, with blue ice or something similar, to keep them in a solid state?
I got all excited about fat bombs when I first started on this journey, 5+ years ago. Recipe sounds similar to what you mentioned - cocoa, coconut oil, a few other things. I kept them in the freezer, and they were very satisfying and refreshing. And then I reached a point where they weren't interesting anymore.
Not long ago I was clearing out/rearranging my freezer and found the container of fat bombs. I was intrigued to find them, but in no way inclined to eat them. They are still there; I will throw them out at some point.