Help integrating Pfsense firewall

My company is trying to put a new pfsense firewall in our network. We currently have two peplink load-balancing 580 routers with 5 isps between them. We are looking for a best practices suggestions (such as NAT placement).

5 ISP–> Pep580 --> PfSense Firewall

Hi - welcome to the forum!

Questions:

  1. What is the main reason for the pfsense?
  2. What inbound traffic do you need to support?
  3. The 5 ISP connections, why 5, what are their relationships? Is it a primary high speed and 4 slower backup connections? Or are all 5 ISPs the same?
  4. Do you have any spare public IPs on any of the ISP connections?