Hopefully this is the right spot to put this, I’m not affiliated with the company in any way, I just saw that the default spot to buy this seemed to be Amazon, and for anyone who wants an alternative (in Canada), you can get the box for $34.95 right now: IoT Power Relay - Version 2
I’d never heard of PiShop before, but I ordered a couple of days ago, and it just arrived. Wired up and tested, works great. Thanks to the Sienci team for making it such a simple add-on, I never have to reach for a vac or router switch ever again!
Also, it recommends 16 AWG, but I only had 20 AWG on hand, seems to be OK so far, though I can always rewire it if it starts misbehaving.