It is possible to run 3 consul servers on the same IP address if you shift the various ports to unique numbers to avoid conflict, but you don't have to do that.
Instead, add interface alias's in your /etc/rc.local (just before the exit 0), e.g.:
In my case, wlan0 is a dhcp assigned interface. The following commands add three new alias interfaces, wlan0:1, etc, with their own stat IP Addresses.
ifconfig wlan0:1 inet 10.0.0.41 netmask 255.255.255.0