Question about Ubiquiti UniFi Cloud Gateway UCG-Fiber

Yes, you can plug your Cat7 copper cable into the router's 10 Gigabit RJ45 port to achieve 10 Gbps. The router has a 10G RJ45 port that supports 10GBASE-T, which is compatible with Cat7 cables. The SFP+ ports are intended for fibre optic or direct attach copper (DAC) cables and require special modules, so they are not mandatory for your copper cable if you use the RJ45 10G port.