rx 550 recognizing pcie x16 slot as x8

pciex16 slot   Dan pciex16 slot

yes you should have no issues if you connect to your bottom slot on the board, however just make sure your CPU has plenty of PCI-E lanes so

The size represents the number of direct connections provided by either a PCIe slot or card PCIe x1; PCIe x4; PCIe x8; PCIe x16 These Hello, we need to connect another device through the pcie x16 slot of AGX Orin, and the other device can start normally only after AGX Orin

bf slot yes you should have no issues if you connect to your bottom slot on the board, however just make sure your CPU has plenty of PCI-E lanes so ‌PCIe X16 Golden Edge to PCIe X16 Slot Adapter Features : PCIe x16 card edge PCIe x16 slot PCIe Gen 3 16 lanes signals of PCIe designated 4 Layer PCB