I received my two Wyze Locks yesterday and installed the first one on the back door. I plugged the gateway in about 15 ft (5 m) from the door. Setting up, configuring and calibrating worked well.
Next I installed the second Wyze lock on the side door. It was about 25 ft from the first gateway. When I tried to pair it I always got an error message that pairing failed. I moved the gateway closer (15 ft and then 3 ft) and it still failed which the gateway could still see and control the first lock which was now more than 25 ft away.
I read online that a gateway could control up to 10 Wyze locks
I am pretty sure that it will work with two gateways but would rather use one. I submitted a support request but have not heard back from Wyze.