This a description of my home network.  I recieve my internet from AT&T fiber 300.  From the AT&T fiber BGW320-500, I connect to the first Deco M5 (Main) by ethernet cable.  Out of the first Deco M5, I connect by ethernet to a Netgear 5-port gigabit ethernet unmanaged essentials switch.  Out of the switch, I connect to the other 2 Deco M5s by ethernet cables.  When I use the Deco app to test the speed, I get 360Mbps down and 120 Mbps up.  When I use the Ookla app to test the speed by any of the three Deco M5s, I get 360Mbps down and 360Mbps up.  How can that be.  Thanks for any comments......