You could pull of 2 if they were a pair, an if you have a really good filter.
Sure, throwing two Oscars in too small of a tank can be "pulled off" but isn't the right thing to do. I'd say go with one or maybe none. Get an appropriate sized tank if you want large cichlids.
I would say 1 or 0 depending on the dimensions of the tank. Bow front tanks tend to lack in length which isn't ideal for an Oscar. I wouldn't have 1 in anything under 4ft long.