I'm not sure if I should have oriented the red dots differently, but the tape turned out nice.
![](https://i.imgur.com/TfasRXFl.jpeg)
They look to be in A-B with both mics facing directly forward. If you want to more closely emulate the "as worn in a hat" config, rotate the mics partly away from each other so the red dots indicating the on-axis point of the mic are angled outward, similar to how they would be "in hat"
In other words, even though you are changing the orientation of the mount by 90 degrees by rotating it from the horizontal hat-worn to a vertical clamped orientation, in order to maintain a similar horizontal angle between mics you'd need to rotate them by less than 90 degrees, due to their attachment angle on the mount. However, because that will also point them upward somewhat, you may want to rotate them a bit more than 45 degrees. That will make the horizontal angle narrower than it would be "in hat" but won't point them upward too much.