I tether via a cable.
Because it's my work (Dev/Tech/Nerd) I have multiple phones with SIM cards.
So I physically tether a phone to the device.
I don't believe the device OP linked can a bridged WiFi network as such.
You can do a similar thing with a Mac:
Plug in your iPhone via a cable, then share the iPhone's tethered data connection over the Macs WiFi or ethernet port.
It's actually a good way to get around restrictions on some mobile SIM plans that don't allow them to be used as Data SIMs!
I tether via a cable.
Because it's my work (Dev/Tech/Nerd) I have multiple phones with SIM cards.
So I physically tether a phone to the device.
I don't believe the device OP linked can a bridged WiFi network as such.
You can do a similar thing with a Mac:
Plug in your iPhone via a cable, then share the iPhone's tethered data connection over the Macs WiFi or ethernet port.
It's actually a good way to get around restrictions on some mobile SIM plans that don't allow them to be used as Data SIMs!