I sometimes trim the corners from a yellow Post-It, giving me two little triangular pieces of paper. I then stick those onto the capsules so that when they point directly forward, the microphones are angled apart as I wish.
Here's a photo showing this type of arrangement. I don't know whether it's OK to leave these on for, like, years, but neither do I know whether they'd stay on that long anyway. You can see that the one on the left is already becoming a little impatient, and wanting to get up and wander around a little. That's understandable, these days especially.
--best regards