A and CNAME records for rev proxy and www servers

[blarneyme]

My company will host 2 internal DNS servers in a DMZ on a private network (10.0.0) and has three domains: example.org, example.com and example.net. There will be an nginx reverse proxy in front.

In db.example.com when A records are created without a reverse proxy I would use:

http://www IN

A 10.0.0.100
reverseproxy IN A 10.0.0.130

in db.example.org

http://www IN

A 10.0.0.110
reverseproxy IN A 10.0.0.130

in db.example.net

http://www IN

A 10.0.0.120
reverseproxy IN A 10.0.0.30

In db.10.0.0 would it be:
100 IN PTR

http://www.example.com

110 IN PTR

http://www.example.org

120 IN PTR

http://www.example.net

130 IN PTR reverseproxy.example.com

Is this correct or what needs to be changed to host 3 domains from the DNS servers?

Thanks.