Having a Masseu coming to our home is purely for convenience and words of mouth. They might not have the certificates but depend on their years of experiences.
Going to a centre might mean safer and in terms of reputation, it is more credible.
For my pre and post massages, I engaged a Masseu to come to my place as I have 2 young children so when they zzz, I can start massaging. It really dep on your comfort level.
Chin Yin