I know CAsA has pulled up a few for the sticky pads, the out come I do not recall and will depend on the CAsA office anyway.
There are more than 1 or 2 fixed wing and helicopters around with such mounts both outside the cabin and inside the cabin on VH registered aircraft. So it is reasonable to assume that someone has actually got an EO to apply it/them.
I do not expect it would be a big task to get an EO done (or a rego added to one) maybe a few hundred $'s. I do expect that it would need to be attached and tested by a LAME most likely with calibrated scales followed by a log book entry that will increase the cost.
I expect that there are generic locations they can not be mounted, the procedure they are mounted and test forces to be applied after mounting dependant on speeds and G ratings of the aircraft. There will need to be a ongoing test/inspection procedure for the mount also.
Maybe ask this guy - no affiliation but have used him before.
https://www.bowdeneng.com.au/