2 link same subnet with failover

[joaoguariglia]

Good evening!
I'm new to pfsense, mine is the following, I need to do this structure below:

I have two dedicated links that access another company, they gave me these two dedicated links, I know it's strange but the two links are from the same network, my mission is to connect my lan on these two links failover, I could not do it on Pfsense gives the error:

IPv4 address 192.168.10.230/22 is being used by or overlaps with: OPT1 (192.168.10.221/22)

But in cisco it works, I'm going to change from Cisco to Pfsense in cisco the config are:

Building configuration…

Current configuration : 3837 bytes
!
! Last configuration change at 10:21:53 UTC Tue Mar 7 2017
! NVRAM config last updated at 20:09:58 UTC Mon Mar 6 2017
!
version 15.0
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname ROUTER1
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
!
no ipv6 cef
ip source-route
ip cef
!
!
!
!
multilink bundle-name authenticated
!
!
!
!
license udi pid CISCO2911XX sn XXXXXX
!
!
!
!
!
!
!
!
interface GigabitEthernet0/0
description (SITE1-A)
bandwidth 30000
ip address 192.168.10.230 255.255.255.252
ip nat outside
ip virtual-reassembly
load-interval 30
duplex auto
speed auto
!
interface GigabitEthernet0/1
description LAN Local
ip address 192.168.20.200 255.255.255.0
ip nat inside
ip virtual-reassembly
load-interval 30
duplex auto
speed auto
!
interface GigabitEthernet0/2
description (SITE1-B)
bandwidth 30000
ip address 192.168.10.231 255.255.255.252
ip nat outside
ip virtual-reassembly
load-interval 30
duplex auto
speed auto
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
ip nat pool MYPOOL 192.168.20.200 192.168.20.200 prefix-length 30
ip route 10.10.54.0 255.255.255.0 GigabitEthernet0/0 192.168.10.229
ip route 10.10.54.0 255.255.255.0 GigabitEthernet0/2 192.168.10.233 10

!
!
!
!
control-plane
!
!

scheduler allocate 20000 1000
end

1-) What should I use to make both Gateways work
2-) I need them to fail over
3-) I'm going to make a static route on my LAN to go through one of the two failover gateways