Best way to setup 2 interfaces w/ and w/out wireguard vpn?

So the boss (wife) can have her own WiFi for the woke shite on netflix and I can keep all my devices behind a VPN. To be clear, I only want to allocate a 2.4ghz wifi for no VPN and the other 5g and connected devices to go through wireguard?

kind regards

this I guess, Isolate VPN connection to specific interface (iot) if you would consider the wife being IoT (or the other way around)