I've used them in a couple of ways. I put Nord on one and run it alongside my Philippine Wi-Fi, so I have both a Philippine IP and a US IP. Say you have a work laptop and can't install a VPN on it. I connect it to the GL.iNet (US IP), so the work laptop doesn't need a VPN. Those are the same routers KeepYourHomeIP uses. The antennas are a bit fragile, though, so keep them away from young kids. There are something like 5 different GL.iNet models, and I've used a few. Not sure if one was the Slate, but GL.iNet is solid.

I just bought one myself but haven't used it yet. It seemed more capable and flexible than the other, more plug-and-play options.