what height do yous usually have your kitchen sockets, is it a set height or all depending on the kitchen thats being installed ?
old money lolstandard worktop height is 36", so sockets above worktops generally 4" -6" above that.
Would look terrible imho. And no better than sockets on top of skirting throughout the rest of the house. Personally I'd have insisted on another 50mm above the upstand.About 1.2m fits nicely, then again Ive just been doing a kitchen today and the kitchen fitter insisted they went 100mm above the worktop height which is straight above the upstand of 100mm, personally I think it's too low, but the kitchen fitter said put them there and so did the customer.
but usually, 1200mm seems ok, hang on, but another kitchen I did, it was crucial that they lined up with the tiles.
Keep doing what you are doing. Co-ordinate with customers preference, wall unit heights, and size and placement of tiles.
In my experience its the tiles that have the biggest say.