We need a webhook for each client install and we just reached 5 and it's not letting me add a new hook.
Chargebee allows you to create a maximum of 5 webhooks. Moreover, it is not possible to filter and send the webhooks to specific servers. You could configure a common server to receive all the webhooks and then handle the routing at your end.
Could you please elaborate on your use case and why you'd like to have more than 5 webhooks?