There's a ton of TV wall mounts that let you extend the TV, but I can't find any locally in Australia that let you mount to a cabinet (our walls are too flimsy for mounting). I understand this is because a mount that allows a TV to slide to the front of the cabinet would cause it to topple over from the weight, but we are fixing our cabinet into the floor so should be ok.
Something like this but local: https://www.homedepot.com/p/MORryde-Short-Slide-Out-and-Swiv…
what about a monitor stand thats made for a large monitor?
Walls being flimsy > Its not the wall you hang a TV or anything heavy on.
You should not try to hang a TV onto a Gyprock wall sheet without using a 'stud or nogging' to screw into.
I take it that there is no Stud or Nogging behind the Gyprock wall sheet where you want to position the TV..