Let's say I'm renting out two different properties as a sole proprieter.  They are treated as separate businesses, as in the QBI forms.  If I have a sole proprieter contractor perform over $600 of work during the year on both properties, should they be issued separate 1099-NEC forms for each property, or can they be issued a single form?  Relatedly, if the contractor performs $300 or work on each property, does that put them over the $600 threshold for being issued a 1099-NEC form?