In my experience this is not a commonly published spec. Further, the angle tends to be direction dependent. For example you might be able to pivot 30° in ‘this’ direction and 40° in ‘that’ direction. This would be a hard spec to publish. Plus, the frequency response will vary somewhat when the tweeter is pointed straight, compared to angled, because the angled sound path will encounter more interference from the grill.

Probably the same as the Sonance version of them so you might check their site.