evohome won't operate correctly on a desk with all the devices next to each other. The RF signal on these devices is just too powerful and will scramble the comms.
evohome doesn't use constant communication, it uses a digital pulse every 4 minutes to communicate to all devices, and hence so many issues happen when the BDR91's are too close to each other and the comms during that digital pulse gets scrambled when the individual devices communicate back to the evohome controller.
The only effective way to test evohome is with each individual device spaced out correctly by at least a couple of meters from each other.
Comms loss will only flag up after a long duration of no communications, but contact technical support if you have any questions.
