Looking at photos & the quick reference guide, it looks like depending on the trim there are a couple blanks to the left of the wheel, one to the right next to the "TOW HAUL" switch, and that one in the center next to the camera view switch. I agree with
@EOD Guy that last location would probably be the easiest place to modify and add several switches. Otherwise it's four blanks scattered across several locations. Ok if you have only one thing to add I guess?
Edit: that upper right spot is used for fog lights, so only one blank on the left for US models.
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