My family and I (being a party of three persons) are traveling to Shanghai.

and have a two night stay in there. We will arrive in Shanghai on January 5, 2019 at 7:20 pm on flight DL 583 direct from Detroit, MI, USA. We have hotel reservations for two nights at SSAW Boutique Hotel (No.839 Renming Road, Huangpu District). We have a ticketed flight to Siem Reap, Cambodia, on January 7, 2019 at 6:40 pm on flight MU 513. We all have valid passports that do not expire until 2023 being the earliest expiration. We would like to confirm that we are eligible for the 144-hour Visa-free visit. Is there anything we need to do to qualify?