What is the optimal distance to place airport wireless extendor from AirPort Extreme base?
Hello, I have an AirPort Extreme wireless network currently placed in a bedroom (lower level) of a two story house. The signal was not strong enough for my upstairs corner bedroom and downstairs family room. So I purchased 2 airport express wireless extenders. I have placed one extender in the bedroom next to my desktop and run an Ethernet cable hardwired to it. I have place another wireless extender next to my smart tv in the family room and run an Ethernet cable harbors to it also. Recently a Comcast tech came over for another issue and mentioned the extenders are too close to the devices using them and to place them away. First of all, is it true that you would get better connection if the wireless extenders were further away from the devices using them? Secondly, is there an app or method to find out the optimal distance these extenders should be place from the base? Lastly, do I need to configure my network to run on separate bands and connect to the better band that performs a better speed test? Or simply leave the dual band setup and allow my devices to connect to the best band? I really appreciate anyone's help on this as I'm supposed to be getting 100mpbs speed with Comcast and I'm only getting about 30mbps most places in the house. Thank you.
iPad Air Wi-Fi, iOS 10.3.3, Using PC, iPhone, iPad