Basic Question - 2 wifi routers sharing ISP connection via Firewalla Purple in Router Mode

Hi Firewalla community!

I've got a Firewalla Purple and I love it.

Had it set to router mode, connected in-line directly downstream from my ISP connection, with an ASUS XT8 mesh network connected (XT8's WAN port to FwPurple's LAN port).

I'm going to add a separate wifi router to my house, alongside my XT8's, to serve as my IoT network (I've set all the wifi channels to be different, used NetSpot to test and confirm minimized wifi interference). I have a basic switch to add downstream of FwPurple, to allow both my ASUS mesh network and the 2nd router to plug into it, then the switch plugs into the FwPurple's LAN port.

My question is: Given the existing setup above, what sort of changes should I make on the FwPurple's setting to accommodate this?

Thanks!