To me the likeliest spot will be on the same shelf as the router and switch but at the back of the shelf with the router and switch in the front of the shelf...or is that a mistake on my part. What I am clueless about is the access point. Will everyone need this and if not under which circumstances would it be necessary
I'd say the whole package should all comfortably fit on one shelf in your rack.
It appears you can use your house wifi...
Indeed.
Sure but, a separate Wi-Fi isolates the audio control device from your regular home devices
Yes, however only direct control commands are actually forwarded to the Extreme. There is however the control device to server latency aspect. Hence we reserve the right to change our recommendation to using a dedicated access point, which would of course be optional, but again would be a "cheap" off the shelf model, with perhaps a modification to diminish it's impact on the power side of things, as these are relatively power hungry devices which currently is the main culprit.