Yes, on Line 3, None is the right answer if you did not have Self-only or Family HDHP coverage for that month. NONE basically means No valid HDHP coverage, and covers Medicare, no coverage, HDHP with conflicting coverage, and so on.
In the Step-by-step HSA interview did you see the question "Did you have HDHP coverage for any month in 2020? (or however it is phrased)?" You should have answered No. This should have marked each month as NONE for you already.
Well, no matter, NONE is what you want on line 3 for each month.
@aneckar
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