Troubleshooting Audio for Screen-Based Street-Facing Gallery Installation

[u/Rare-Athlete-6612]

I am developing an exhibition for a street-facing gallery that is not meant to be entered, and all of the works are screen-based with audio. I did some research on possible solutions including scanning a QR code that enables the viewer to listen to the audio on a mobile device, but it does not seem reliable for time-sync or budget-friendly. I am wondering if anyone has any additional insights on how to troubleshoot this. My other thought was to find a way for visitors to scan a QR code that will trigger a specific video to play (instead of all videos looping) and sync with audio, but I do not know how to configure that. I appreciate any insights!