what model/type SSD can i use for Acer Predator G9-793

hello there i have an Acer Predator G9-793, and want to know what type/model/size factor of M.2 SSD i can use, also is it possible to use a mount kit so i can add a 2nd M.2 SSD?
Thanks

what model/type SSD can i use for Acer Predator G9-793