As a website owner, how do I track down all the alternate roots I'd need to register with? If each of those charge a fee, how much will I need to spend on each

As a website owner, how do I track down all the alternate roots I'd need to register with? If each of those charge a fee, how much will I need to spend on each root? If I need to perform an OPS task like flipping to a new external load balancer IP, how many alternate robots do I need to coordinate with, and how much testing do I need to verify each root is updated?