Newby would like print supports advice from the Lounge

I have purchased a 3D image from here and about to slice it on my first print job ever, but before I do, I wanted to check if the orientation would possibly work for the supports before I print.
I have a ELEGOO Mars 2 Pro using their software CHITUBOX with automatic supports chosen and enlarged to 95% of the Y axis base size with the Raft height and thickness set to 5mm thinking it might need it as it is sitting on its end and it is hollowed out but I don’t have a clue if it will fall off the plate because of a lack of supports. Also using water washable ELEGOO resin.
Any advice would be appreciated.- maybe I am chewing off more than I can chew for my first print?