DNS is plenty secure due to its simplicity and age. From the perspective of securing your server that is. DNS has numerous flaws when it comes to security in terms of can you trust the resolved name. But that is another matter.

I’d be more worried about the gui, keep that behind a secure proxy or don’t expose it to the internet at all if we’re talking a server at home.

I run my own DNS and it’s virtually a prerequisite if you want to host stuff under a personal domain in a smooth fashion. At least if you don’t want to rely on a big player like say Cloudflare.