I think the figures for an M4 are wrong, because these Deco routers use similar technologies. But it's not 15 watts even with the Deco M5, I find information on the Internet that the power consumption is about 12 watts. What you could do, of course, is simply switch off additional Deco at night with the help of a Smart Switch, for example, i.e. perhaps only have one in operation. This set wouldn't be bad for that, it contains 3 smart sockets that you can then programme with scenes, so you could also save power at night and then reconnect more Deco to the network if necessary (but I wouldn't switch off the main Deco).
Hombli Smart Swiss Socket 2+1
