Use a variable to define the nopreempt state.

defaults/main.yml

@@ -25,6 +25,7 @@ keepalived_instance1_name: 'VRRP_1'
 keepalived_interface1_name: '{{ ansible_default_ipv4.interface }}'
 keepalived_initial_state: 'MASTER'
 keepalived_inst_priority: 101
+keepalived_nopreempt_enabled: False
 keepalived_script_weight: 2
 keepalived_vrouter_id: 51
 keepalived_non_local_bind: True
@@ -54,7 +55,7 @@ keepalived_instances:
     vrouter_id: '{{ keepalived_vrouter_id }}'
     notify: '{{ keepalived_notify_script }}'
     priority: '{{ keepalived_inst_priority }}'
-    nopreempt: False
+    nopreempt: '{{ keepalived_nopreempt_enabled }}'
     v_addr:
       - '{{ keepalived_floating_ip1 }}'
     track_script: