Yes. But then again, there's no facing in default D&D. A bonus to gaze attack saves because you have a blind spot doesn't take into account if the gazing opponent is approaching from another angle. We've got a much bigger blind spot than Arsiniotherium, after all (the entire 180 degree expanse behind us).So, a creature with a gaze attack such as a medusa that attempts to petrify the beast will fail if the gazing at it head on, because the arsinoithere won't meet its eyes. It will have to cock its head, as ISR indicates, to see the creature, if it wants to. Behaviorally, should it do so, in order to get a clearer view? It takes eye contact with only one eye for a gaze attack to succeed, right?
Let's just say that it has its blind spot in front, rather than to the rear. Does that work?