The external NVMe SSDs from OWC are aimed at high-end users who create UHD content. Capacities range from 1 to 8 TB but prices are considerably higher than the mass produced NVMe solutions. Two ThunderBlade models can be connected in SoftRAID mode in order to provide increased read speeds of up to 3800 MB/s.
https://www.notebookcheck.net/OWC-releases-ThunderBlade-external-SSDs-with-SoftRAID-and-3800-MB-s-read-speeds.299260.0.html