Changing DNS SOA to Peplink 380's in HA

I have my Peplinks installed with VRRP (HA mode) and I want to look at migrating my DNS SOA over to them.

When identifying my default SOA server (Record) in Network–>DNS Settings–>Default SOA/NS records, should I identify both Peplinks and give them separate ns records (ns1 & ns2) and use their unique IPs? Or should I only list only one as ns1 with the virtual IP they share?

I believe we should identify Peplink by its WAN IPs, not the single virtual LAN IP both Peplink share - which is for your LAN devices only. Here is an example.