Get Out would be messier as a haunt experience because of the POV issue. So many of the movie's "scares" rely on the specific context that they're happening to a Black American. The events of the movie are in some ways metaphorical, but otherwise closely mirror the micro(¯o)-aggressions that community faces in this country. It would be weird to simulate that for a mass, mixed audience.
I do think blackness is central to Us, but it has broader iconography (scissors and red jumpsuits) and themes (being chased by a doppelganger), that were better suited for HHN.