Only got experience of such things in large broadcasting complexes where it was the rule to have a dedicated tech supply with its own earth. In older BBC ones, this was a regulated supply for each individual studio too. Using a large servo operated auto transformer.
But all likely over the top for a domestic type installation. However, a dedicated radial with its own RCD straight from the CU would do no harm. If only for isolation purposes at the end of the day - easier to switch off than each and every bit of gear.