The "verified" element in your search is arguably the most critical. When downloading software that modifies your system partition, you must ensure the file you have is both complete and unaltered. A corrupted or tampered file can lead to a boot loop, system instability, or, in a worst-case scenario, a security risk.
After a clean install of a 7.1.2 ROM and GApps, you may encounter a persistent "Setup Wizard has stopped" error on the first boot. This issue was noted by the community with some Open GApps builds for 7.1.2. open gapps android 712 verified