The following table has:

• 802.11 Wi-Fi channels in black (channels 1 - 14 in 2.4GHz frequency band)
• Zigbee channels in red (channels 11 to 26 shown)

The MX10 can be configured from channels 11 to 25 (dang, wanted 26)

note well: in the USA, we only have Wi-Fi channels 1-11, so the "top" of Wi-Fi channel 11 is 2473 MHz, therefore in the US Zigbee channel 25 is 2 MHz above/away from the top edge of the Wi-Fi channel, and the best choice.

The next best would be Zigbee channel 11, which has overlap with "bottom" of Wi-Fi channel 1, by just 4 MHz.

All other available Zigbee channels have more overlap and are close to the center frequency of the Wi-Fi channel, that is worst.

So my setup outside is channel 25, and my setup in the garage is channel 11