Minimum Threshold for Storage Node Operator Payouts

No, for the wallet address. Accordingly ToS you must use the same wallet for all your nodes.

Who knows? What fee would be in the first two weeks of February?

If you mean for December 2020, then payout has been completed:

You will receive a pending payout anyway. You will lose payout for the month when DQ is happened (and all sequent months too obviously).

That’s right.
If you would opt-in for the

Then you can withdraw your tokens when it’s convenience for you, not when we send a payout.