Recently took the Clink tour, and they showed us the SRO and explained it.
They are yellow squares, about 2' by 2', painted against the back wall of the walkways around the field.
You cannot bring a chair or cooler to stand on, and must stay within the square while watching the game. They have staff specifically assigned to keep SRO patrons from moving up into the walkway during the game.
Of course, you may leave the square to piss or go spend money at the vendors, but you are not allowed to move up to the rail in front of you, or dance in the aisle, or whatever out of the box.
I had a sling when my children were little, that we used to carry them, and something like that *might* be an option, to attach to the pipe of the railing behind you, to be kind of a hammock seat in your square, but the fun police likely would nix it . . . prolly worth a try.
They said SRO tickets were 50 smackers, so affordable, but really, mostly a desperation ticket for a game you absotively posolutely gotta see.