So I did some testing with Arrays of numerics and seeing how close together they are. I found that the array of numerics are the same size, if you are using a System Array, Classic Array, or Modern Array controls. The Silver Array takes up more space, which didn't surprise me.
I couldn't find anything about smaller arrays, but in my searching I did find this post about small clusters.
The "TopLeftBorderOnlyCluster" is the smallest cluster I've found, but it has the down side of only being able to click it on the left or top edge. The right and bottom edge appear to really be 0px in size and unclickable.