OpenWrt Router Downstream From Primary Router

Objective: Use OpenWrt router and separate network in addition to the primary router.
Background: I live in a shared housing situation, and my housemate has his own equipment (Arris SB6190 modem on Comcast ISP with single dynamic IP and Netgear R6700AX router using Netgear firmware). I would like to use the two Linksys EA8300 devices I purchased, both are using OpenWrt 19.07.7 with one configured as a gateway/router and the other as a WDS access point. The Netgear and OpenWrt routers are configured using different subnets.
(1) is it okay to simply attach the OpenWrt router via the WAN port to the Netgear router LAN port? The OpenWrt IPv4 upstream data shows a Netgear DHCP assigned LAN address and both routers are sharing the same public IP address.
(2) is there alternate configuration that is better?

1 yes
2 not really

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