When I opened their plastic cases to place them, I found a page with instructions in 6 languages, which say different things, show different things, and mean different things... Imagine that there is little connection between the Greek and English instructions. Because I was struggling to figure out how to place them (until I became worried that I chose the wrong size), I scanned the QR code from the front side of the case in order to find support on the manufacturer/importer's website. The product no longer exists and is not supported. I give one star as the lowest rating for the lack of support and respect for the buyer.
Finally, using every drop of logic and Pythagorean applicability, I managed (under sunny conditions and without time pressure - if I had tried to put them in emergency conditions, it would probably have been very difficult or impossible).