Load Balancer CCR1016

Good day to all, I’m just in this world and I need the help of the Forum. I’m working on a ccr1016 to create a load balance on four WAN connections with equal bandwidth.
I have seen several configurations and from what is my most reliable experience should be the PCC. I would also like to configure the possibility in the event of a failure of an internist privide to secure the connection with the other active ones. Any suggestion is well accepted. Thank you very much