The GL.iNet Beryl AX (GL-MT3000) travel router has one 2.5 gig port. It’s priced a little above $100 but some sales might still be going on for it to bring the price below that amount.

The other ethernet port is only 1 gig, so no client would be able to reach the full speed, but you could theoretically share the connection between wired and wireless clients.

The WiFi must be on his machine that he was using to manually download the files, but he later delegated that task to a docker image, sharing the wired connection of the Synology host machine.