[CentOS] Gateway question

Hi

There is a Centos 7 up-to-date box with 2 interfaces, let's say 
192.168.1.12 - enp2s0, 192.168.1.13 on enp3s0. Default gateway on enp2s0.

The gateway is pfsense, IP is 192.168.1.1 with 2 WAN connections

On the gateway the outgoing traffic is routed by source ip to different 
WAN, 192.168.1.12 to WAN1 and 192.168.1.13 to WAN2

On the centos box are set all the route and routing rules:

route-enp2s0:
192.168.1.0/24 dev enp2s0 src 192.168.1.12 table t2
default via 192.168.1.1 dev enp2s0 table t2

route-enp3s0:
192.168.1.0/24 dev enp3s0 src 192.168.1.13 table t3
default via 192.168.1.1 dev enp3s0 table t3

rule-enp2s0:
from 192.168.1.12/32 table t2
to 192.168.1.12/32 table t2

rule-enp3s0:
from 192.168.1.13/32 table t3
to 192.168.1.13/32 table t3


All work when I add
#route add default gw 192.168.1.1 dev enp3s0

And that way I have :

# ip route show
default via 192.168.1.1 dev enp3s0
default via 192.168.1.1 dev enp2s0
169.254.0.0/16 dev enp2s0  scope link  metric 1002
169.254.0.0/16 dev enp3s0  scope link  metric 1003
192.168.1.0/24 dev enp2s0  proto kernel  scope link  src 192.168.1.12
192.168.1.0/24 dev enp3s0  proto kernel  scope link  src 192.168.1.13

But how can I add achieve this only with ip route command ... without route?
Can I add this in any config files (ex: route-enp2s0)?



Thanks

-- 
            Levi