Product Image Background Replacement -- 2

I have fewer than ten product photos that need their existing backgrounds completely removed and replaced with one specific backdrop I’ll provide after we start. Clean edges and natural-looking shadows are essential so the items look as if they were originally shot on the new background.

Please work non-destructively in Photoshop (pen tool or precise masking preferred) and return both layered PSD files and final web-ready PNGs/JPEGs. A quick turnaround and consistent color retention across all images will be the key acceptance criteria.