Transparent mode(FortiGate 60E)

Dear Mr.....

I want to add Fortinet between existing routers.

The existing router is managed by an external SSL VPN.

Can you tell me how to add FortiGate 60E as shown in the image below? How should the CLI be written?

https://help.fortinet.com/fos60hlp/60/Content/FortiOS/fortigate-ipsecvpn/Transparent_Mode_VPNs/Configuration_Overview.htm

Can you review the following items? If anything is wrong, please let me know.   config system settings     set opmode transparent     set manageip 192.168.1.100/255.255.255.0 end     config router static     edit 1         set gateway 192.168.1.1     next end   config firewall address     edit "192.168.1.0/24"         set subnet 192.168.1.0 255.255.255.0     next end