If you control more than one Palisade Giant, you choose which redirection effect to apply. You can’t divide damage dealt by one source. For example, if an attacking creature would deal 8 damage to you and you control two Palisade Giants, you may have that damage dealt to either of the Palisade Giants. You can’t have 4 damage dealt to each Giant or choose to have the 8 damage dealt to you.

Applying this redirection effect doesn’t change whether the damage is combat damage.