The array grounding system is useless in a bolt of direct lightning. Everything in the system will probably be destroyed and there is no grounding in the world that will prevent it. In order to prevent damage from a direct hit requires a lightning suppression system and that will be a completely separate system with air terminals and its own grounding.
This is what I believe is required and optional for grounding ground mount arrays in the NEC
(I put the question mark on the grounding electrodes for the array because I am 99% sure they are optional.)
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Note: If the ground mount rack is metal, it is hard to avoid some amount of grounding at the array even if there is no grounding electrodes
If the array is mounted on the house, the code allows an additional grounding electrode but does not require it. You should not do it.
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