Yes, Moto Z2 Play is a dual sim mobile phone.
Moto Z2 Play comes with Water repellent nano-coating**. Advanced nano-coating technology creates a water repellent barrier to help protect against moderate exposure to water such as accidental spills, splashes or light rain. Not designed to be submersed in water, or exposed to pressurized water, or other liquids.
Yes, Moto Z2 Play does have Corning Gorilla Glass protection.
Yes, it does support OTG.
Yes, but you have to buy a special mod for it.