The Issue Here...
I believe that most Australian homes constructed within the last several decades have probably resulted in your problem:
- Every house generally has some sort of bathroom/laundry or kitchen/laundry or "straight-laundry" concept at play.
- This means there is generally space for a single trough and drain for the washer, a floor-dryer or a wall-mounted dryer, a washer and maybe some cupboard space*
My suggestion would be to crawl about the internet for a good second-hand machine, and maybe make inquiries to various manufacturers for new machines.**
* Our house uses one-side of the kitchen (Northern-part, Kitchen is partitioned off in a "square" at the South-Eastern corner of the house) as a laundry. There is room for a topload washer and electric dryer (associated 20A outlet and switch fitted).
Houses commissioned by the same group, but with a separate "laundry" space (with associated trough and air-conditioning ductwork) used a stacked pair of some sort for a long time.
** Manufacturers can often be downright useless in getting back to you, so, your mileage may vary!