How to implement one outgoing IP for multiple servers?

Question

proxy

Good afternoon!
For several days I have been trying to find a solution and experimenting, but without help it does not work.
There is a cluster of servers (AWS EC2), outgoing traffic will come from them in large quantities.
The task is to make one IP address for all outgoing requests.
The colleague advised to twist HAProxy.
It is possible to make a load balancer, i.e. a single entry point (incoming IP), and I need one outgoing one.
I am considering other solutions as well.
Thanks for any advice!