"As far as I understand, many writing guidelines frown upon using the possessive case with inanimate objects.."
This is not true at all! Using the apostrophe+s genitive is not substandard English, and it is not regional, either. Nobody's frowning upon anything. Please be assured that it is correct, standard and extremely common to use this form for a wide range of inanimate nouns. This is especially the case with geographical terms (countries, regions, cities), organisations (such as companies, committees, teams) and time nouns (seasons, months, days of the week).
NB There's no such thing as an Anglo-Saxon country!