Thanks for the heads up. Found out there is concern of permanent imprint on the back even with skin protector on. This is due to the pressure from the inner design uneven surface. Some say you can rub it off very hard with cloth but envision the constant design pressure for 1 year later?

Yes indeed. I had a similar case on my S7 Edge that left hard to remove imprints.
No I did not. I had a back screen protector on my old S7 Edge which was in a similar case and suffered the same issue. The screen protector will have permanent marks.

Never used Ringke but I believe as long as there is a design on the inner part of the case, then it should leave marks.