BIG-IP DNS (GTM) best practice for internal vs. external zone naming

I have a vary similar setup. What I've done in the infoblox public view, created a sub zone that delegates to a DMZ GTMs(where Wide IPs are configured resolve NAT addresses). For the Infoblox Internal view, created another sub zone that forwards the delegation to an internal pair of GTMs.(resolves to real IP)

Then in infoblox, we just create cname records in the appropriate view/zone to point to the appropriate name.delegationzone.