What type of lots/venues are you building in Sulani?

I want to try and build some sort of research facility to study mersims. Maybe it’s operated by some Strangerville secret agents who have captured a few for evil experiments and research (inspired by The Shape of Water). I usually play a pretty realistic game and I’m not very interested in supernatural sims so I’m hoping this will be a way to introduce mersims while being somewhat believable. Create a story around a sim who is trying to set them free. I’m not sure yet how I’ll work it all out if anyone thinks it’s a somewhat interesting idea and has any suggestions!