The Platio Ocean Blue Opal Tile creates 18 watts per panel, and has superior traction provided by a sand-blasted top layer of tempered glass. Traction tests are simulated using the DIN 51130 method and achieved a rating of R12 (operator does not slip until >27°).
https://safetydirectamerica.com/germanys-din-51130-slip-test-whats-it-good-for/