Have a look at this Fact Sheet from the Tenants Union. It says that you must allow a “reasonable” number of inspections in the last 14 days of the tenancy. There is no definition of “reasonable” but you can apply to NCAT for a ruling that these extra inspections are unreasonable.
Bringing ten people through is not a private viewing. Maybe you could hang around and warn the prospective tenants about the “terrible neighbours next door” and tell the rental agent you will do this every time unless they pull their heads in.
If you do go down the NCAT route, you can apply online for orders under Section 61(1) “An order specifying or limited the days and times, and purposes for which, entry to the residential premises by a landlord or other person is authorised.”