This article presents the different resolutions available on the HERO7 Black camera, as well as the field of view options.
In order to record an upside-down video, lock the screen to UP first, then record while the camera is positioned upside down. To access the feature, swipe down to go to Preferences, then Touch Display, then Landscape Lock, then Up.
Hope this helps.
Marius, there is not a single word on actuall "angles of view" in that article!
Details on Hero6 can be found here: