Ratio of pods with AWS Firelens

Looking at trying out AWS Firelens integration and have a question about using Firelens with ECS running on EC2 and if it's possible to just have one Firelens task per EC2 instance or it will always be sidecar pod to one application pod? We have approx 1350 application pods, so this will equal 1350 sidecar pods!
Is it better to look at using Fluentbit/Fluentd?