Just so you know, those armour abilities are not the same:
In the standard 1-hit version, blocking any attack removes the ability, so it can only ever block 1 attack at most.
With your 2-hit version, it can block up to 25 attacks! Why? Because the armour only fails from 2 attacks from the same location (relative to the armoured unit). Better to have the armour as a passive at that point (if you want it to only block 2 attacks): "Block any 2 melee attacks from within Range 2 and remove this passive" or something like that.