We got a miele washing machine, and a zanussi dryer. I would highly recommend them both. You do get specific mounting brackets for stacking on top of each other, but often only for the same brand appliances. I lifted the dryer on top of the washer easily enough, put a board of wood in between them to leasen any marks and vibrations and it's been fine.

Washing machine was quite pricey, and it was later pointed out to me that we could have bought a cheap one and replaced it twice with what we spent on it, but it is amazing, and I'd expect it to last a very long time.

The dryer is decent too, and was half the price of the washing machine, was a heat pump dryer so is very energy efficient, but I am warned that it will be harder to repair if something goes wrong with the heat pump.

I can look up model numbers if you like.