We suggest to use a own user, at least for hosting webdomains - the admin user has sudo permission.
So basicly do the install for web01.domain.tld as hostname, then create a new user, in this user create a new web domain with dns support and add all you want to have. Then your server should reply instantly if you try manualy with nslookup above.
About dns cluster you’ll find a lot of useful informations in this thread here: Hestia and DNS management?