I know you have a lot of devices, but I have no idea how all these device are actually connected, whether it’s WAN to LAN, LAN to LAN, the relationship of the routers to each other (are they facing each other, WAN to WAN? Running in parallel to separate ISPs?). In the world of networking, it’s the small details that make all the difference. There's just no way to provide guidance w/ the current "sketchy" outline you've provided. If it helps, draw a diagram w/ some labeling, doesn’t have to be a work of art, just something decent.