FiOS Router

Set Router to Bridge Mode

Login to router administration interface

Select "My Network" on the top bar

Select "Network Connections" > "Advanced"

Select edit icon for "Network (Home/Office)", then click "Settings" on the bottom right

Check the box for bridge mode under the "Bridge" section

If you set up another router and it detects that the ISP modem/router is still active, it will use the 10.0.0.0/16 network rather than the 192.168.0.0/24 network