Not sure where the trend for having an switch FCU above counter for each appliance is. Might be nice in an industrial type setting, and or if it was a dp switch in a rental maybe, but in most domestic settings I would just extend the ring down to a double socket, or even a spur, and just plug it in.
As said, it is very unlikely you would have a problem plugging a washing machine and tumble dryer into the same double socket.
- A washing machine will only pull max current while heating the water which is fairly low duty cycle, which might not even be 13a anyway.
- A lot of tumble driers dont use the full 13amp available.
- A lot of users will not use both at the same time anyway, unless doing several loads back to back.
Daniel