spec sheet says 4 M.2 supported.
"where it might be placed?"
Should be in semi-plain sight on motherboard.
PRO series motherboards tuned for better performance by 14 Duet Rail Power System, DDR5 memory with Memory Boost, Lightning Gen5 PCIe, Extended Heatsink, M.2 Shield Frozr, Wi-Fi 6E, 2.5G LAN, USB 3.2 Gen 2x2
www.msi.com
4x M.2
M.2_1 Source (From CPU) supports up to PCIe 4.0 x4 , supports 22110/2280/2260/2242 devices
M.2_2 Source (From Chipset) supports up to PCIe 4.0 x4 , supports 2280/2260/2242 devices
M.2_3 Source (From Chipset) supports up to PCIe 4.0 x4 / SATA mode, supports 2280/2260/2242 devices
M.2_4 Source (From Chipset) supports up to PCIe 4.0 x4 / SATA mode, supports 2280/2260/2242 devices
6x SATA 6G