Inbetween Mcdonalds and Hungry Jacks just opposite the famous Surfers Paradise sign in surfers mall - rates very high. No joke saw Jupiter and Saturn here many times through 14 and 16 inch when we used to astro busk. Very laminer airflow. Massive light pollution well thats anothef issue...
Drawing from the experience of the dozen or so nights I have stayed up in the central wheatbelt near Koorda (300km North East of Perth) the seeing has been good to excellent more often than not... I expect that is due to the location being far enough north to avoid the jet stream. The transparency and sky brightness are as good as any location I have ever seen in Australia.
Without long term data to rely on it would be a guess, but I wouldn't be surprised at all if it gave Arkaroola a run for its money.