I found a list of quiet blenders on a clickbait site. All of those appeared to have some outer shell to absorb some sound. I noticed the Vitamix blender I often see in smoothie shops was there and was by far the most convenient as long as you have room to open and close the cover. The other seemed to have some sort of outer jar that you would invert over the blender vessel. Again, it would need headroom.
maybe you should consider a countertop “garage” to match the cabinetry.