Using CPA + Popunders (Domain Question)

I've over the years harvested around 100+ domains that I keep renewing for what ever reason and haven't actually used for any purpose.

I'm wondering how ever, if I include a iPhone X lander on a domain like "somerandomsite.com" would this still convert the same as "iPhoneXGiveaway.com"? Has anyone done a test for this and compared how many people actually pay attention to the domain name in scenarios like this.

For CPA alone it is very much useful if you have main keyword in domain.It gives little trust to people.
For CPA + popunder domain name may not be matter much, but better to have.

now a days domain name is not most important... but if you are working on CPA it's need to use main keyword in domain name....