4 ring induction hob smallest aperture size??

I hope someone can help. I want to install a 4 ring induction hob and the granite worktop is 70cm wide. The narrowest hob aperture I have found is 56 cm wide which only leaves 7 cm border either side of the hob which may be too narrow so that the granite will snap.

Without surfing through hundreds of hobs and checking the aperture size, does anyone know a hob that has the smallest aperture width?

Thanks.