Could I use a M.2 to PCIe riser 8x? My M.2 is PCIe 4.0

Thanks for the advice! Sorry, forgot to give more information about my server I use a

Prime B550M A (wifi) motherboard - 2x PCIe 3.0 1x slots

Ryzen 5500

16 GB RAM

NIC card = Intel X540 t2 (recently purchased)

LSI HBA card I planned to purchase = LSI 9211-4i - PCI 2.0

There will be bottlenecks? I have 7200 rpm drives, can I clarify, if each drives is 200 mb/s and PCIe 1x use 1gb/s. I will be good? The LSI HBA card is one SAS to 4 Sata, so 4 x 200 mb/s = 800 mb/s. I’m not sure if this is how it works.