Hiring a legal content writer who is actually based in Nantes changes the work in ways an offshore hire cannot copy. French language content is expected, not optional, and language law backs that up. Style and craft carry real commercial weight here, and Paris behaves very differently from the regions.
Practically, that means your legal content writer writes in the spelling, currency and legal conventions used across France, references Nantes and wider Pays de la Loire accurately, works inside your hours so a question does not cost a day, and quotes in EUR. Languages on the bench for this market: French, English.