There's a requirement for them anywhere that not everyone is able to keep them at home. There are waiting lists for spaces in them, in areas where a lot of people don't have any outside space, and/or live in small flats, and/or can only access any potential space by climbing stairs.
I'd say there will be a correlation in most areas between number of people who can't store a bike at home, and number of people who can only park and charge their car on street.
In areas where there's no need for bike hangars, the charge points should be integrated into the sides of a parking bay which has been converted to green space with seating.