I looked at getting a set of the 'official' Kia aluminium scuff plates, but found these on Ebay, stainless steel and you get a set of four for around the price Kia charge for a pair. Easy to fit too as they have a lip that wraps over the edge.
Polished Stainless Steel Sill Protectors for the Rio (released 2017). Engraved as shown above. (4th Gen, Released 2017). Number of Sill Protectors: There are 4 Sill Protectors in the Set. The 2 front Sill Protectors are 480mm long, and the 2 rears are 140mm long.