Currently, the setup done by my brother, not techie at all, is pretty bad. they have the ISP router with wireless (Device1/SSID1) on the ground floor. they have 2 ethernet runs going up to the second floor connecting to two other devices. one looks to be a router (Device2/SSID2), one an access point (Device3/SSID3). They are all TPlink, but all 3 have different SSIDs. While connected to SSID3, I get an IP address I assume is on device3, but when I go to the admin screen of device3 (I think i am on device3), it shows the info for Device2. When on SSID2, going to admin page of Device2, i see the same info, but dont know how to control the AP, Device3. I want to simpify things and have everything use the same SSID and Device1 manage DHCP. I dont want to put the ISP router into bridge mode and have a better router1 like i do for myself. Can I just get 2 wired access points to replace Device2 and Device3, all use the same SSID and move around freely, and get this to work? Any low cost APs you can suggest? Will then look at their user guides on how to set them up. Or are we talking something more complicated like mesh and more expensive devices? Thanks.