There's not much tail for a missile battery (from "littoral combat teams") though - it's a small unit, which can last on relatively small supply runs for extended periods of time This is data collection unit with some "guerilla" fires, aimed at not so much preventing activities as at monitoring them(bringing around persistent small/tactical sensors rather than theater ones, coming once in a while) and optionally constraining them. Not a coastal defense in a proper stopping sense.
Not a unit meant to engage PLA task force - but should you leave behind a beached transport, tropical forest on an island couple hundred miles away may find a tomahawk. Or there will be a LAAB element, which may be AD, or may result in unexpected F-35B FOB. Etc.
And yes, given minimum footprint, they're very much meant to operate under PLA monitoring in neutral battlespace(1st island chain, i.e. under PLA superiority), and remain obscure enough to somehow survive. Unless China establishes firm control over those islands, which for political reasons it doesn't.
IMHO MLRs mean assaults and mop ups are unavoidable.