Yes, there is an SAFT module for Portugal in Odoo v16 that is suitable for certification with the Portuguese Tax Authority. The module is called "l10n_pt_saft" and it is included in the Odoo core modules for Portugal.

To install the module, you can follow these steps:

1. Go to Apps menu and search for "l10n_pt_saft".
2. Install the module by clicking on the "Install" button.
3. After installation, configure the module by going to "Accounting -> Configuration -> Settings -> Localisation" and selecting "Portugal" as your country.
4. Generate the SAFT file by going to "Accounting -> Reporting -> SAFT Export" and selecting "Portugal" as your country.

Note that in order to use the SAFT module for certification with the Portuguese Tax Authority, you will need to have a valid digital certificate issued by the Portuguese Tax Authority. You will also need to configure the module with your digital certificate and other relevant information such as your company's VAT number and tax regime.