Add a second example Location so that there are more than one.

group_vars/all/gateway_locations.yml

 ---
 locations:
   'Seattle':
+    'name': 'Seattle'
     'country_code': 'US'
     'hemisphere': 'N'
     'timezone': '-7'
+  'Amsterdam':
+    'name': 'Amsterdam'
+    'country_code': 'NL'
+    'hemisphere': 'N'
+    'timezone': '+2'
+

hosts.yml

@@ -16,13 +16,13 @@ hosts:
   gateway1:
     ansible_host: 37.218.242.191
     groups: [openvpn]
-    ip: 37.218.242.216
+    ip: 37.218.242.191
     # The 'ip_vpn0' is for the internal network overlay only. Assign an unique
     # value for each host
     ip_vpn0: 172.16.1.3
     # Set the egress source address for ipv4. This address should be distinct
     # from the 'ip' value above to prevent traffic leaks.
-    egress_ip: 37.218.242.191
+    egress_ip: 37.218.242.216
     location: Amsterdam
   gateway2:
     ansible_host: 204.13.164.252