Well, two of those are microphone mounts, not capsule holders . . .
And, the middle one is a pretty crap design, putting the capsules in each other's 'line of fire', so to speak. Putting them in that mount the other way 'round, so they point out away from each other would be similar to the excellent (old) Audio Technica AT825; the bit of 'air' between the capsules sounds much better than pure coincidence, and is still fully mono-compatible for all practical purposes (despite what coincident 'purists' will tell you).