|From what I heard, individual Signing Services want you to join their RON platform and then they will give you their work.|
I would reach out to everyone you work for now and see if they are offering a platform you can join.
I am not going to name companies, but most allow you to join for free and train you. There is one out there that wants to charge you per closing for their platform use, so be careful and chose carefully. To my knowledge, there is not a generic platform that randomly has closings available for all companies doing closings, just GNW and a mixed bag that comes your way. It's similar to how we get them now for loan signings.
I don't do them, just what I believe is how it works. Still not enough information and def. response to fees for me to invest and take a gamble.