Q3, I'd personally move the real ip addresses back to the firewall and have address the local subnet vlan 102 from some private addresses. The routers would then have a static for the real addresses to the firewall, and have the firewall NAT them. Q4, A topology diagram won't hurt. I would say that you're probably ok with what you have planned.
How to Set Up a Router with a Firewall - dummies If you are a broadband Internet user, the best way to keep malware out of your computer is to set up a hardware firewall. A hardware firewall is an electronic gizmo installed between the broadband modem and your computer. It’s often included as part of the router. A hardware router monitors all incoming and outgoing Internet traffic. Your Router's Security Stinks: Here's How to Fix It | Tom May 26, 2020 The Best VPN Routers for 2020 | PCMag Feb 13, 2020 Test Your Router - RouterSecurity.org
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Enable or Disable the firewall in your AT&T provided modem You must be connected to your high speed internet via your 2Wire Gatway/Modem to view this link. The firewall status will be displayed under the Firewall heading on the right side of the screen. Click either of the Firewall icons (these look like locks) or click the View Firewall Status link. Click the Firewall Settings link in the navigation bar. The 10 Best Secure Routers of 2020 - Lifewire