I thought you would have known this.
For students, they almost always do the tapping in a classroom setting, and faculty/admin in offices or classrooms.
Alums are the only ones that may have unusual settings. They try to get alums to Miami around Homecoming to tap them, but it's not always possible. One of my friends was tapped in Orlando.
As for the tribe, they have participated and endorsed the Iron Arrow traditions and ceremonies since the 1920s, long before F$U offered them a few bucks to use the Seminole name and likeness.
The initiation ceremony is on tribal lands (or at least that's how they did it from the 1920s to when you and I were at UM). This is not some cheap copycat routine.