I currently have a setup with 6 routers and thinking of upgrading to a good mesh system (have been recommended TP-Link) with a backhaul (since the cat6 lines are already connecting the old routers). Any suggestions and reasons which one to get. On Amazon there are routers which vary a lot in cost . I want a system which does not drop speed (hence the backhaul). We do stream a lot (upto 4 devices at a time)