Thought others might find this interesting - it’s a scan of my local 2.4GHz space. Wi-Fi channel numbers along the bottom (very small, hard to read - sorry!):
The red (strong) spike around channel 9 is the SmartThings Zigbee (using Zigbee channel 20). Because you can’t change that, I’ve deliberately moved my Wi-Fi well away (it’s the lump that centers on channel 1). The other lump around channel 6 is my Arlo camera network. The only reason it looks so huge is because the base station is right next to my laptop.
The other green spike is the Zigbee used by the Microinverters on my solar panels.
It’s a real shame the SmartThings Zigbee channel isn’t right at one or other end of the 2.4GHz band, rather than (in my case) being quite near the middle. It would make it easier to avoid clashes with Wi-Fi networks.