Each filing entity needs to file the Form 1096. The name, address, identification number on the Form 1096 must match the same information on the Forms 1099-NEC. Assuming the forms are all being filed by you using your social security number or one single EIN you only need to file one Form 1096 for each type of form your are filing, even if only 1 document of a type.
For example, if you, using your social security number are filing 5 - Forms 1099-NEC and 1 Form 1099-Misc. You need two Forms 1096; one for each type.
If you have an EIN for the business(s) and also use your social security number for the rental business, for example, you would need to separate by filing entity with each filing a Form 1096 for each different type of 1099 form.
Here is a link for reference. See paragraph E.
[Edited 1/18/2021 4:22pm]
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