AWS EKS Anywhere required to use MetalLB package

I have a question regarding the use of the MetalLB package for our on-premises Kubernetes clusters and its interaction with AWS services. If possible, I would like to seek clarification on the following:

Is a paid subscription to AWS EKS Anywhere required to use MetalLB in on-premises Kubernetes clusters?

What are the possible limitations or recommendations concerning the use of MetalLB with AWS services such as Amazon Route 53 or Elastic Load Balancing for on-premises clusters?

What other AWS best practices or recommendations exist for providing load balancing for Kubernetes services on on-premises clusters?