According to the case study I read, Alpha employs a polycentric approach to global human resources. Because they have a superior awareness of and local expertise about their own homeland country, they will frequently hire a national of their own country for senior jobs. This can guarantee the MNC will meet the market demands of the country while also matching their management style with the local way of life and aspirations. As a result, decision-making is extremely decentralized, with local managements in charge of everything from salaries to guidelines and more.
From what I read and if I had to recommend an approach, I would suggest a geocentric approach.