A foreign-owned corporate in China wish to appoint my staff to provide consultation service in China

My consultants are employed in Singapore / Malaysia and I wish to send them to this particular client for about 12 months. The client will provide the accomodation to my staff and will pay to my company directly for the consultation fees charged. I will fly them back to Singapore / Malaysia every 30 days and may I know whether M visa is sufficient? Appreciate for your advice.