Can only find hubs with one M.2 slot in them. Several dual bay enclosures, though. You may have to get just an enclosure or both an enclosure and a hub.

https://www.amazon.com/Dual-Bay-Enclosure-Adapter-Dissipation-Aluminum/dp/B0B5QKKXNQ

Of course, it's only a 10gbps connection so you won't get the best speed. But a lot cheaper than the one chx linked to. And you can always use software raid if you want raid.