Enclosures with 2 TB3 ports include the OWC Express 4M2 and Lacie Bolt 3. NVMe sticks include the Samsung 970 Pro or 970 Evo Plus (a value proposition of PCIe 3.0 getting you more storage space) and the WD Black SM850 (a PCIe 4.0 device).
So pick a good PCIe 3.0 NVMe stick, a solid Thunderbolt 3 enclosure - and make sure it has two ports for daisy-chaining more Thinderbolt devices - and accept that's the best you can add to the M1 Macintoshes. The kind of NVMe drive you'd consider would be PCI-Express in 4-lane configuration, so maximum of 3948 megabytes per second for PCIe 3.0 or 7896 for PCIe 4.0 - while even the fastest PCIe 4.0 drives don't sustain their peak speeds, reaching around 3000 megabytes per second due to a combination of caching and cutting back speed to avoid overheating. Best answer: Thunderbolt 3 is 40 giga bits per second which translates to 4 giga bytes per second due to 8 out of 10 bits being data and 2 in 10 being error correction.
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