I don't have an answer to your specific question, but my general recommendation is any time you are using a USB hub in a fixed situation, use a powered hub. That solves the current limit issue. Since you are proposing to use a USB hub connected to a router, I assume it will be in a fixed installation and therefore, you can use a powered hub.
RB750Gr3, RB750r2, CRS326-24G-2S (in SwitchOS), CSS326-24G-2S, CSS106-5G-1S, RB260GS
Not sure if I beat them in submission, or they beat me into submission