Sit/stand anywhere where you have an unobstructed view facing north. I saw some of them by accident while sitting on the steps of the Trinidad North quiet pool with my kids.
But as everyone has said, don't expect to watch a full fireworks show. You're seeing the higher and bigger ones only. You definitely don't have a front-row seat.
In other words, if you think of it as an extra added little bonus, you'll love it. But if you expect to see a dazzling fireworks show from CBR, you'll be sadly disappointed.