Most likely Andy's 4108HS-8P-4ks
Just be aware Reolink only supports their doorbell when used with a Reolink NVR. The 4108HS-8P-4ks NVR you are considering has features like face detection, perimeter protection, IVS, people counting, heat map etc, which may or may work not work when used in conjunction with the Reolink DB. I'm using the Reolink (my best doorbell camera yet) with a Costco / Lorex NVR. It captures great images 24/7, accurate time and date stamps, adjustable brightness / contrast, zone detection and the doorbell actually works... but... the face detection, two-way audio and push notifications do not work when connected to my Lorex NVR. What features will or will not work with Andys NVR remain to be seen. The
Blue Iris folks have had better luck getting the Reolink features work, but BI may not be ideal since you mentioned you clients are not very tech savvy. NET: Ring doorbells are good in their own right and fit a target audience perfectly (i.e. not tech savvy, want a video doorbell, only have access to WiFi and are more or less simple plug and play) The biggest downside of the Ring is it requires a monthly cloud subscription for all its advertised features to work. Ironically... I just happened to see
this video yesterday comparing the Reolink with the Ring Pro 2. FYI: Read through the comments following the video as they contain some interesting details.