Turn the clips around the other way so the capsule is overhanging the clip, and you've got boundary mics to sit on a stage lip. The mounts with 4 holes imply they'll be screwed down to a surface. The other ones wil the slots might be putting velcro straps through and attaching to a rail of some sort. Without fastening them down they'd tip over which is why I suspect you have them this way for the picture. You wouldn't really want to orient them that way as the clip base would cause an early reflection point right in front of the capsule.
EDIT: Seeing your other thread asking about stage lip setups, can I assume my theory is correct?