Davy49
, if you are looking for better wireless signal and throughput for a more consistent experience throughout your house, don't use the wireless functionality that is included in the NVG589. Go get your own higher quality wireless router that has real external directional antennas to hang off of the NVG589. Getting an access point that minimally supports 5GHz 802.11n can make a big difference. Getting one that supports 802.11ac can elevate your throughput and performance of any 802.11ac capable devices to rock star levels.
You are right about centrally locating the wireless access point in the highest location possible. This will get you the best possible coverage for a single access point. However, this doesn't cut it in my house, even with my own high powered Cisco access point. I have one particular area at the front of my house that gets a fairly weak signal. So, I have two access points. I've placed the additional access point to cover the area of my house that previously had weaker signal strength.