Your DNS records should be configured the same as a normal website. Point the A records of any domains you want to map to your WordPress site's server.
We recommend using CloudFlare as your DNS host, but you can manage DNS records at your domain registrar or any other CDN or DNS provider you want.
Here are instructions from CloudFlare on how to set up DNS records properly.
If you aren't sure how to set up or manage your DNS, please submit a ticket and we are glad to help.