Ipconfig /all is safe to post.
Some people are concerned about the MACs (PhysicalAddress). Overall, I do not view the MACs as a risk.
For more about IP addresses:
https://www.lifewire.com/what-is-a-private-ip-address-2625970#:~:text=When a device such as,with a public IP address.
As I understand your routers and the planned/required connectivity the Arris would be the Gateway with DHCP enabled.
The Asus router (DHCP functions disabled) would be configured as an AP with a static IP address via the Arris router.
First ensure that you can get everything initially connecting (wired and wireless) and running via the Arris alone.
Second, then configure the Asus as the AP for wireless use.
Third, connect wired devices to the Asus and ensure that local wireless devices have network/internet connections.
Plan it all out step by step before doing anything. Familarize yourself with the necessary router admin screens and options for both routers. Be sure to write things down in case you need to go back and undo something.
Keep in mind that if there is a problem then Arris will likely blame Asus and vice versa.
And ensure that all Ethernet cables are known to work at the applicable speeds.
Revised line diagram being:
ISP === (coax, DSL, fiber) ==> Arris Modem/Router (as Gateway )[LAN ports] ---> wired devices and ~~~> local wireless devices plus ~~~> Asus Router as AP ~~~~ > local wireless devices and [LAN Ports] ---> local wired devices.
~~~~> indicating a wireless connection.
Again, feel free to edit and correct my line diagram.