The normal selection question, with its layout set to dynamic rows, unfortunately doesn't look as good as the horizontal selection on PC. Because I have 8 answer alternatives (columns), the last two alternatives end up on a separate row with a lot of spacing between them, which isn't very visually appealing and makes it hard to recognize the answer alternatives as a scale. If I had fewer alternatives, this would have been a good solution, though.
I have considered the fully labeled scale, however the dynamic display option doesn't look very good on PC when you only have one unlabeled item (options to the right, a lot of empty space on the left, "unnecessary" background color). The "single items (center)" layout would have worked great, but once again it doesn't adapt to a narrow phone screen when there are 8 labeled options (depending on character length). In a way it's better than the horizontal selection, though, because the option labels don't overlap with this question type/layout, but instead the last options get "hidden" to the right of the questionnaire border/screen.
Thank you for your answer, I'm glad to hear you're looking into it!