Watchcat configuration - basic question

Hi, I want to make sure that if my router loses internet access it should reboot.

I understand the plugin Watchcat can do this. Though I'm unclear which Interface do I select.

My router is connected to a modem.
The wan has:
PPPoE Protocol
Device: eth1

In the luci-app-watchcat, for Interface drop-down, it lists:
Bridge: "br-lan" (lan)
Ethernet Switch: "etho"
Ethernet Adapter: "eth1" (wan, wan6)
...
Tunnel Interface: "pppoe-wan" (wan)
...

I'm assuming I should select 'Ethernet Adapter: "eth1" (wan, wan6)' - is that correct?

Thanks

In your case it doesn't matter, as it is used for the restart interface scenario.