@dkellar, I do not know the answer to your original question. It would depend on if there are any outlets that are fully locally supported. However, if you are worried about 2.4 GHz radiators (and I want to make it clear that it is my opinion that you don’t need to be) you should also be powering off your smartthings hub as well as any wireless end devices (such as the smartplug you’d be using for the wifi router). Not only does your smartthings hub transmit on the same 2.4 GHz freq that your wifi router does for talking to zigbee devices (and also 900 MHz for zwave), but each device also transmits for communicating back to the hub.
Here is my suggestion. The modem shouldn’t be transmitting any type of wireless signal, it is wired only. I would install an un managed switch straight out of your modem, then plug in your wireless router and also the smartthings hub, then you can do whatever you please with the wifi and not bother the hub. Also, my old router had a switch to turn off the wifi transmitter only.
Most home ISP solutions only provide a single DHCP assigned WAN address. Therefore, this idea will most likely not work. Either the ST Hub, or the Router would get the one WAN address. Also, having the Hub direct connected to the modem would allow it to talk on the Internet, but would most likely not be able to talk on the LAN behind the router.
It all depends on how complicated a home network topology one wants to create…
I gotta agree with Dan on this one. Be careful when advising people about their networks. In my area it’s very popular for folks to get a modem/router all-in-one from their internet provider. This means if you shut off the power to that, you’re losing everything. Plus, you can’t plug both a router and the hub into most modems. They only have one internet port. And you could get a switch but then you would have to pay to get two IP addresses from your ISP. And then again, you have the problem that your hub is no longer on your home LAN and unable to control local LAN devices.