They are snapped in but also have standoffs with clips that are almost impossible to remove even if you had access from behind.
I used a plastic trim to get underneath near standoff, most of the time the clip would unsnap from pressure from trim tool. If it didn't I released the clip u pussing a putty knife from the top or bottom to release clip then apply pressure to letters and the standoff will snap. Only 1 of 6 of the standoffs did the clip slide off the standoff instead of the standoff snapping.
I replaced my letters with the blacked out version. Snapped them in place and also used 3m double sided tape since I wasn't using the clips.
Link to black letters
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