nomacs image viewer (free for commercial use)
"nomacs is a free, open source image viewer, which supports multiple platforms. You can use it for viewing all common image formats including RAW and psd images."
"nomacs is licensed under the GNU General Public License v3 and available for Windows, Linux, FreeBSD, Mac, and OS/2. It is free for private and commercial use."
Free, fast, and lightweight image viewer for commercial organizations. It even supports branding and configuration import/export (not sure if automating import during install or via script is possible).
Install is easily scripted: https://nomacs.org/questions-and-answers/
"How to make an unattended installation of nomacs?
When using Windows you can make an unattended installation of nomacs:"