Are the listed dimensions correct?
On the https://framelabs.eu/en/technische-daten/ page both the 6″ and the 9.7″ is listed as being 222×309 mm, which is roughly the size of DIN A4.
On the https://framelabs.eu/en/artframes/ page, however, there's a clear difference in size between all models.
Could you check the sizes, please?