You should check out the Xeon D offerings from Supermicro. They make some M-ITX motherboards with embedded Xeon D chips that sport dual 10GB Ethernet. Used one in a freenas system at one point for years

Looks like the X10SDV-TLN4F[1] has everything you mentioned besides a second m.2 slot. Although its 8 cores they are a few generations old and low power (45w TDP on x86). For true compute its not exactly fast but for something like a high performance file server in 1U connected to a disk shelf, they are really nice.

[1] https://www.supermicro.com/en/products/motherboard/x10sdv-tl...