Option A.) Remove everything, including the spoiler, before tinting. It isn’t that time-consuming. If you’re looking for tips on how to remove the spoiler, there are plenty of helpful YouTube videos.
Option B.) Install the film without removing the spoiler. Seam your film down on the defrost line underneath the spoiler.
Option C.) Order the glass from Honda. It shouldn’t cost more than $220, and it’ll be much easier and quicker in the long run.