Wiring in to engine bay fuse block?

Dinglehead

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Ok I think I probably already know the answer to this... but hopefully not.

I need to wire a trigger wire from a relay controller under the hood. The engine bay fuse block is fully sealed - and it doesnt look like theres a good way to tap a fuse in there. Am I missing something? Is best practice to just go through the firewall and tap the fuse block in the cabin?
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