Bats are cool.
I have known people in a couple of bat neurobiology labs (one also owls). Echolocation.
You could throw small objects into the air when they are flying around and they will go after them as if they were prey. Lots of fun.
I would guess the bat shots were made in a place know for frequent bat presence,
at the dark side of dusk, and used a flash from below.
You could point a camera up (tripod) at the right time with the right focus and click off shots when the bats are in the right place.
Or you could use a trigger mechanism (like a trail cam) to catch a lot of shots by itself.
This is a lot like shooting pictures of fast moving small fish. They move too fast to be creative in the moment. You have to plan it ahead of time. Lights, camera, maybe place some obstacles to funnel their movement to your shoot location.
I think of bats as coming out at dusk. Have not seen them flying at other times.
Maybe there are bat watching groups (like bird watchers) that would have some info.
Sometimes there maybe news stories of well known places (caves, belfries).
Twenty years ago, when our backyard was more immersed in a copse of large trees (walnut, cheery, oak), bats would fly through the backyard a lot. Now 80% of these large trees are gone, there is more open sky and I'm not seeing so many bats.