Apparently they have been sightings up in Mount Crawford, sixth creek in 2015 and 2020. Mount Crawford would be an excellent spot for them not far from Mount Crawford is two large reservoirs in the para wirra area and barossa area. There is also the little Para River and reservoir too.
I actually believe that they can possibly move through residential areas in the Adelaide plain areas too unseen in the very early hours of the morning. Because there are reserves and gullies they could navigate through Cobbler Creek reserve is a possible place that they might visit also.
I live very close to Cobbler creek reserve. It's big and it kind of connects in the direction of areas a Yowie could be living more regularly. My brother had a scary encounter with someone or something in the early hours of the morning near a gully reserve area in a populated area. He said the guy was big, grunting at him, possibly was killing a cat and chased after my brother. My brother and I will never forget this was shaking and was actually sick when he got home.
Was it a yowie I don't know would be remarkable given the populated area. But with the gullies and little reserves all connecting back into less populated areas which would be yowie habitat who knows.