Server connection to CCR1036

Hello

I need help with my CCR1036 to connect my 2 server. I have tried everything I knew but nothing works :(.

My WAN is considered to port 1 and DHCP on port 2, server 1 on port 3 and server 2 on port 4.

My question is, do I need switch or I can make it work with direct connection?
DHCP server is 192.168.1.1 and it used switch only for house devices…
Server 1 IP is 192.168.2.120
Server 2 IP is 192.168.3.212

If it is possible to make connection direct on routers port without switch, how can I do that?

Thank you for your help:)