I always thought on the new
Ibiza and Arona (Leon I don't know) the DRLs are now both front and rears. When I test drove the
Ibiza and Arona (both with LEDs all round) this is the case, as I've test driven both, and yes whatever position on the switch 0, auto, parking, dipped. They remain on as long as ignition is on. Didn't check if it could be changed on the infotainment or not. Else you would need to use Carrista or similar to re-code it.
On my current
Ibiza (with Bi-Xenon + LED DRLs) and previous Leon (Led DRL+headlights etc). On pos 0, only front DRLs are on, on parking lights, rear tail lights come on, and DRLs dim.