Hi @Everynone
offtopic: do I have to @you like this that you get a notification? And how did you made this video in quick way? Might be helpful to actually showcase issues in the future.
Back to topic:
Oh boy did I struggle with that. Manually adjusting the location of the object now works thanks to your normal - make rotation. I forgot about that and tried severely different things before I realized 
The result now is perfect and works on every axis / different wall like a charm.
But I do had to rotate my object in the blueprint like crazy, see in the image. This way, when I place it ingame. Green is actually the bottom and blue the top (how it should be).
