2 computers

does my premium cover both computers

First, I’m an Avast user and not an Avast Team member. I also use Avast Free so I can’t speak from personal experience.

I don’t believe it does, there are multi user licenses available, but I believe that is for something like 10 devices.

Check this page

Personally I don’t like the auto payment mandate as you have to remember to cancel. If you were on a single annual license you might find a bargain close to the renewal date.