Yes, you can use the second screen without the safe harbor. You should be prepared to make your case if it is ever questioned. Aggregation is not something you have to choose, and is a personal decision.
As far as selecting only the profitable properties, this is not the intent of the deduction. In other words you can't pick and choose each year based on the profit or loss of each property. The real decision is based on whether the rental properties rise to the level of a trade or business and the safe harbor provisions. The negative figure does eliminate the deduction and the loss carries over to adjust the following year's QBI.
Here are some links with information that will help you decide.
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