NTP solution with vrrp to secure time sync for 800 vm

How to get 800 vm and infrastructure to sync the time in a safe manner. When you see the customer only has one poor NTP server that can not meet all of the time sync requests. And for sure if this one fails every thing will fails. No problem you thingking we just get one more NTP server,
then you begin to realize what a job this would be to config 800 vm and infrastructure to sync on
secondary NTP server. No problem you solve this with two routers, two NTP servers and a vrrp.

Now you have a failover and don't need to reconfigure 800 vm and infrastructure for NTP sync.
You need to use routers that can be NTP servers. Now you sync your servers and infrastructure against one of the active Routers in the VRRP.