alll risers support 3.0 (x1). well if motherboard support only 2.0, than the riser will do 2.0 as well.
Holy shit that worked!
Above screenshot is from Asus PRIME Z270-A.
And a screenshot from HIVE OS after running gen3 for the last 20 minutes with no issues:
I have 6 rigs with those mobos, so hopefully they will take to gen3 fine as well.