Good point Ragnar!.
Over here in NZ, we have the standard depth mounting block, which by memory is 23mm deep.
If you need any more depth than that, I think the deep one is 57mm deep.
Of course, with any sort of concrete walls (not block walls) everything has to be either chased into the wall (not a thing I've ever been keen on) or run in exposed conduit (ugly, if it's not done properly).
Pretty much here, if you want to create a "white elephant" product, design it with a box that is different to the standard size one here.
There was a line of light dimmers here a couple of years ago that seemed to disappear off the face of the earth after a couple of months, reason being, it didn't fit into a standard box, because of the size of the heatsink and quite frankly, there would be no way I would be having a device that large on any of my walls, this thing was HUGE, compared to the size of a standard switch-plate here.
Let's face it, these days if you're not young, you're old - Red Green