motherboard with two m.2 slots
How to Add More M.2 SSD Slots? - PC Guide 101
A Z390 motherboard has a total of six M.2 slots. Four of these slots are located on the side of the motherboard and are connected to the chipset via DMI 3.0.
Best LGA 1151 Motherboards - ElectronicsHub
When combined with its 6 expansion slots, M.2 SSD slot, and 6 SATA ports, this makes for a great gaming PC motherboard.
What generation are the NVMe slots? – Q&A – Best Buy
Dual M.2: This ATX motherboard is equipped with flash NVME M.2 (PCIe 3.0 X4 bandwidth) and AHCI M.2 (SATA 6Gbps) slots, of which NVME M.2 maximum speed Up to 32Gbps.
Cisco Nexus 7700 10-Slot Switch - Cisco
There are actually two free m.2 slots available under the GPU (4 m.2 slots in total if we're including the included SSD and wifi card).