This is what I received from the kitchen designer

With regards to
having your washing machine and tumble dryer of the ground, you will have to be really careful as to what washing machine you choose
and read the finer detail to see if they can be positioned of the ground. For example,
I have spoken to Samsung this morning who have said their washing machines have
to sit on the ground, you can position a tumble dryer higher but it must sit on
top of the washing machine"

There is no problem with raising the tumble dryer, which is why you frequently see dryers stacked on top of washing machines!

I have seen various examples of raised washing machines on Houzz and the machines seem to be Miele, AEH and LG.

Problem seems to be locating the outlet hose and making sure the washing machine base is strong enough to take the weight and vibrations and securely anchored to prevent movement … "there is no reason why it cannot be done provided the base it stands on is designed for the job - strongly and solidly braced from below to cope with the weight and vibration. Any half-decent chippy, builder or DIYer should be able to do this.

The W/M flexi waste hose should still exit as shown in the W/M instructions - loop up to a minimum height before emptying into a trap (which will need an extension!) Ie - do not have the outlet hose just falling down from your raised-height machine or you'll find it very dry inside...

Thin battens firmly attached to the raised base will stop the W/M wandering during spins.."

and a solution

"I did this for a B&Q fit that I did some time ago I used a belfast sink base unit with solid top, 2220Hx610Dx28Wmm End panels down to floor a standard 600 base above washer all fixed to wall with L brackets and the machine was a AEG which was supplied with foot clamps so the legs where fastened to the unit and at the top I fixed the top plate off the customers old integrated fridge to hold the top in place not heard anything back so I am guessing that its been fine"

So it looks as if it can be done, but needs some thought and care! I would love to hear from anyone who has done this, what washing machine they used and how it has performed?

After a bit of research, I found the correct name is a "laundry pedestal" and there are any number of these on the net - including one for Samsung!

https://www.samsung.com/us/support/answer/ANS00033270/

I will be having words with my kitchen design expert! https://www.samsung.com/us/support/answer/ANS00033270/

I think there is no problem with the dryer over the washing machine, problems seem to come from raising the washing machine, but there does seem to be ways around it so I can't think why they manufacturer would not recommend it!