Yeh OK, I didn't realize there were mount holes on the side.
When you turn it 90 deg does the displayed image turn back and display the image vertically, or can it be corrected on your phone/tablet.
So assuming you get the image vertical then,
The genuine would be your best bet, especially if it has a picatinny on it, do you know who the Aussie importer/distributor is.
But you will probably have to jigger something up yourself, shouldn't be too hard. If you was to make an angle bracket or mount to pick up them 3 holes in the pic then put a rail on it.
Just need a quick release clamp to grab the picatinny.
Something here may suite. https://www.ebay.com.au/str/globalhuntingindustries?_trksid=p4429486.m3561.l2563
Or some quality camera brackets, adapters or adjustable mounts from a place like this may get you out of trouble.
https://www.ebay.com.au/str/niceyrigshop?_trkparms=folent%3Aniceyrigshop|folenttp%3A1&_trksid=p3542580.m47492.l74602
I got one of these for my infiray. https://www.ebay.com.au/itm/292920155103
You should be able to fit screws through the slot on the top into the 2 holes on the side of your thermal. The just bolt the base onto your aluminium plate.
It has a push button safety release to save the thermal falling off if the clamp happens to work loose.
Good luck with it.