Cannith Infusion Items stack?

[Stradivarius]

I'm wondering if I wear twoitems with cannith infusion proc, is the chance calculated per item or is it just once overall? That is, if I have two items with cannith infusion will I have double the chance of proc'ing than with just one?

[Fisto_Mk_I]

Chances calculated per item, so you have multiplicate chances from many items, but cooldown (if present) shared for all items that can proc for this effect.