Salford is not a district of Manchester. It is a separate city with its own council, its own university and a history quite distinct from its neighbour across the Irwell. Businesses here routinely present themselves as Manchester firms, which surrenders a genuine local position in exchange for competing in one of the hardest markets outside London.
MediaCity is a market of its own
The broadcast and digital cluster at Salford Quays — the BBC, ITV and the production and post-production supply chain around them — is a business-to-business economy with nothing in common with ordinary local trade. Equipment hire, studio services, transport, catering, security and specialist IT all sell into it, and those buyers work on credentials, referral and framework agreements rather than local search.
If you serve production, that needs its own page in the industry's language. Almost nobody local has written one properly, and the buyers do search.
The city is bigger than the Quays
Salford covers Eccles, Swinton, Worsley, Walkden, Irlam and Cadishead, which have nothing to do with the waterfront and behave as ordinary suburban markets. Worsley in particular is affluent and distinct. Businesses serving those areas do better naming them than trading on a MediaCity association that means nothing to a resident of Walkden.
Regeneration has split the market
Parts of Salford have changed enormously in fifteen years while others have not, which means demographics and buying behaviour vary sharply over short distances. A page written for the Quays apartment market reads badly in Little Hulton, and vice versa.
Competition is moderate
Salford is more contested than Bury or Oldham but considerably softer than Manchester, and the overlap with Manchester results means some of that competition is incidental rather than deliberate. Naming Salford explicitly is usually enough to separate yourself from it.