I'm not sure if they made a design change since our 2010 model for the engine hood but...........
Have a really close look at the right side (or maybe the left side) hinge assembly for the hood. It sort of works to open and close like a parallel system of pivots and brackets. On mine, there is a small piece that swings into position to prop the moving assembly against itself, and hold the hood open.
If not........I open the hood as far as it will go, and place a "C" clamp on the inside of the hood to one of the windshield wiper arms. Actually, this system holds it open further than the first way.
Ken and Terry
2010 Georgetown 330TS being pushed by our
2017 GMC Terrain toad (4 wheels down)