According to the capacity formula, short cage should be fine, and on a hard tail it is fine (I run short cage clutch, 34t narrow/wide, 11-36 on my hard tail). However on a full sus you need to account for the rear suspension also. Technically I found it’s fine on my full sus but I was getting grindy noises on compression and trouble shifting at times. When I went for a clutch mech I changed back to a medium cage and it’s all smooth (full sus also has the same 34t/11-36 set up).
In fact I’d say a clutch kind of dispenses with the need to go shorter as it’s retaining tension where possible.
Oh, and go for an X9 Type 2 over an X0. It’s a fraction of the price and does the same job. The X0 is just slightly lighter but performs the same. Break an X0 mech and it’s getting v.expensive. However X0 cranks and brakes are worth the money.