Drop-in mode and NAT mode

Hi there,

I currently have 3 Internet lines (1 Leased line, 2 FTTH) Peplink 710 is directly connecting to ISP without any routers with NAT mode configured, so I now would like to put leased line into WAN3 to make Drop-in mode.

In my case, 3 lines will be into Peplink 710 only without router and can they exist both Drop-in an NAT mode?

Thanks in advanced.