I cannot believe there is not an option on this phone to set more than one timer at the same time. That boggles my mind. My crappy smart phone from 10 years ago even had that option. I honestly would not have purchased this phone if I knew that before hand. That is just lazy.
I downloaded that one and unfortunately, half the time the timer alarm doesn't go off. If you sort reviews by most recent, you'll see a lot of people running into that problem.
Go into device settings>apps>3 dots>special access>optimize battery usage>change "apps not optimized" to "all">clock>turn off battery optimization for the google clock app.