Landing page domain name?

Hi yall!

So I'm currently about to start my first attempt at CPA. I've made and tested both landing page designs
& content lockers.

I'm now about to purchase my domain but my question is. How important is the domain name? Does it have
to related to my niche?

I'm not planning on using free traffic, but instead bringing traffic through ads.

Thanks!

An easy to remember domain and not something that look spam it can work