I'm not even sure that quarantine facilities need to be in remote areas. When we had a dedicated Infectious Diseases Hospital in Melbourne, it was located in Yarra Bend Park - the building is still there but with different use since the Kennett slash and burn. It functioned very efficiently and kept proper control over infected patients so that nothing escaped.
The other thing is that if quarantine facilities are built in remote ares, who is going to staff them? They need specialists, and do they want to move to remote areas? I doubt it.
The reason to do it, is so when there is an inevitable leak, a town of at most 50K gets shut down, not a state of 5mil.
That lessens the cost of lockdown, and makes politician less reluctant/slow to instigate them when they may
be necessary, but could still be short.
Staff ... either drawn from or relocated to the supporting community on a permanent or semi-permanent basis. Basically, if you work at, or in connection with the quarantine station, two weeks off work before you can leave town.
That community would need ongoing restrictions including who can enter and leave, and when, in exchange for a huge chunk of Fed/State cash/economic development for the town. It can't be so close that people commute daily from Melbourne.
Alternatively, fly in fly out, and workers serve a (presumably shorter) quarantine period at the start and end of their (at least) 14 days on.
Personally, I think we need a pre-HQ system at our dry air bases. A tent city and a field hospital (plus medivac if needed) at Weipa and Learmonth. All international flights land there (except bubble countries).
5-15 days there before even qualifying for 14 days in HQ. Also, more use of home quarantine might be made available for lower incidence countries that don't qualify for a travel bubble (ie NOT the UAE !!), such as Vietnam and the former island of Formosa - at least as they were a month ago - they are now back to requiring full HQ.
For super high incidence countries (eg India now), maybe a Christmas Island facility, obviously everything there needs to fly in/fly out. But prisons are terrible environments for COVID spread, so the staff would need to stay there while the quarantinees star at the disused casino. 2 weeks there before even qualifying for 2 weeks in Aussie HQ.
As I see it, HQ is current 99% effective, which is excellent really. It's just too much to ask of it to be perfect. Also, it needs to be (at least) 99.9% to provide the protection we need (ie 10 times better), and *actually* 99.99% effective to increase our border flow 10 fold to a more tolerable level.