Which OSI layer would Little Snitch and Pi-Hole operate at?

I see pi-hole logs for DNS queries that I have blocked on Little Snitch, just wanted to understand this better.

Per the OSI model, are both at Layer 7, since little snitch is a software based network monitor and Pi-Hole is a DNS blocker? So the DNS query comes first, is passed through Pi-Hole before the packet is blocked by Little Snitch?

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