^^
The miniature DPAs are so tiny they are more or less a truly omnidirectional omni across all audible frequencies. Unlike larger omnis, they have hardly any directionality at all even up into the highest regions.
With a pair of omnis that close together, the resulting recording is going to be quite mono-phonic. Heally method is predominantly monophonic from the lows up into the midrange. Using larger omnis which are more directional up top, and pointing them 180 degrees apart provides some stereo difference at the highest frequencies. With microphones as small as the 4061, a 180-degree orientation instead of a 0-degree orientation will make very little difference.
If I needed to use the 4061 that close together I'd place some sort of baffle in between them, tape them to the opposite sides of something, or mount them in the foam balls I use as DIY acoustic pressure equalization spheres. All of those things will make them more directional at high frequencies. Barring those things, I'd mount them farther apart.