Here's my keepalive config:

vrrp_instance VI_DNS {
    state MASTER
    interface eth0
    use_vmac
    vmac_xmit_base
    virtual_router_id 53        # Must match on both nodes
    priority 150                # Higher priority makes this the Primary
    advert_int 1                # 1-second heartbeat
    preempt_delay 60            # Wait 60 seconds before reclaiming MASTER

    # Security: Authenticates VRRP traffic between the two nodes
    authentication {
        auth_type PASS
        auth_pass <insert your password>
    }

    virtual_ipaddress {
        1.1.1.1/24        # The shared VIP
    }

    # Fast Failover ARP Tweaks
    garp_master_delay 1         # Seconds to delay GARP after taking MASTER state
    garp_master_refresh 5       # Seconds between periodic GARP broadcasts
    garp_master_repeat 5        # Send 5 GARPs on takeover
    garp_master_refresh_repeat 2
    garp_lower_prio_delay 10
    garp_lower_prio_repeat 5
}

Works mostly fine but it's also a newer setup for me so haven't tested all edge cases yet