The recently released film Bodies Bodies Bodies takes place in a McMansion:

What happens to a group of vapid, bored, rich gen Z-ers/millennials holed up in a McMansion during hurricane season when the wi-fi goes out?
If the film Bodies Bodies Bodies is anything to go by, they’ll probably end up killing each other — unless someone else does it first.
While some might say the McMansion itself is a horror, McMansions are no stranger to horror stories. How exactly might a horror film involve a McMansion? A few ideas:
-This particular film follows 7 friends. This means plenty of space for people to sleep, live, and interact. A McMansion provides plenty of space.
-The tackiness or gaudiness or lack of authenticity of a McMansion can provide a creepy or unsettling backdrop.
-The McMansion falls apart at a key moment or the limited architectural quality lets the characters down.
-The extra interior square footage a McMansion offers provides more space for nefarious actors to operate.
-The McMansion could be set in a neighborhood of McMansions, perhaps unfinished, that are all creepy and ominous.
–A horror film set in suburbia can play off a common idea that suburban life is not as happy or successful as it seems. How much more so could this be true in a McMansion, a home that tries to broadcast its success in obvious ways.
Combine a horror film with the negative traits of a McMansion and there are plenty of options!