Are you sure it will even work with "just" a router. It might depend on sending all your data to the companies internet server. There are many products like this that then end up in the landfill if the company goes out of business.
So how much hacking do you really want to do. You can't generally see wifi traffic with wireshark. Even if you know the encryption keys or run it with no encryption actually intercepting the traffic is hard. Microsoft has disabled the function even if the wifi chipset in your pc has the ability to go into monitor mode.
So first step is to buy a small switch that has the ability to mirror/monitor a ethernet port. TPLINK "smart" series of switches has this, about $25 will get you a 5 port switch.
You could first try to place it between the router and the modem. This is a little difficult because the traffic will be mixed with your other traffic because of the nat and it only sees traffic that goes to the internet.
The other way would be to use a old router as a AP. Force the wifi device to connect to that. You could then place the switch between the AP and your router and see all the traffic.
This still may not be enough. You can now see the ports and IP it uses. The problem is the traffic might be encrypted with normal HTTPS. This now depends on your ability to do a man in the middle attack against the device. It all depends on how strong it certificate support is. On a web browser you would get a warning if someone attempted to intercept your traffic.
After all this you might still be just at step 1. If it uses some custom control software you would have to figure that out.
.......hacking stuff even when you have full access is not easy.