Either/Or - multiple network links

[PaxVobiscuit]

Control Plane 1.6.7

Catalina 10.15.1 (19B88)

I have 2 separate possible ethernet connects - Thunderbolt Ethernet Slot 1 (part of a OWC Thunderbolt C Dock) and a Belkin USB-C LAN dongle.

The dock is new, previously if the dongle was active it would disable WiFi, and enable it again if the dongle was inactive.

What I am trying to achieve is that if EITHER ethernet connection is active, that WiFi be disabled, or if they are both inactive, Wifi is enabled.

I tried creating 2 rules - on/off - for each network connection source, but it seems to have given CP a headache because it just stops switching, and will only switch to the desired network state if I restart CP.