I need to setup an Airport Extreme at signal's source; a location not generally accessible.
Does this mean that an AirPort Extreme will connect to the modem using a permanent, wired Ethernet cable connection?
I am thinking of using an Airport Time Capsule near (location) my iMacPro, connecting
my printer (HP Office Pro 8600) via USB,and using wireless connections with
my other devices including: HomePod, iPads, PC, et.al
This might work.....IF....the Time Capsule is located where it can receive a fast strong wireless signal from the AirPort Extreme. Line-of-sight between the AirPort Extreme and Time Capsule would be ideal. If the WiFi signal must pass through 3-4 walls between the AirPort Extreme and Time Capsule, things will likely be dicey as far as reliability.
Keep in mind that even if a wireless connection will work, you will lose at least half of the potential wireless speed on the entire network when you connect AirPorts using wireless. A wired Ethernet connection between the AirPort Extreme and Time Capsule would be highly recommended, since it will provide far better performance than a wireless connection between the AirPorts.
The end result desired is a completely cloaked network.
Not sure if you were aware that Apple does not recommend "hiding" a network. iPhones, iPads, and other mobile devices are known to have difficulties connecting to this type of network, so things may or may not work reliably.
As far as "security" is concerned, there are any number of free utilities available on the Internet that will reveal a "hidden" network in seconds, so anyone who wants to "see" your network will be able to do so very easily and very quickly. But, it's your call.
Finally, you will likely find that only the print function will work when you connect the HP device to the USB port on the Time Capsule. Advanced features like Scan, Fax, Copy, etc will very likely not be available since these functions are not usually supported over USB on a network connection. It would be much better if you connected the HP device to the Time Capsule using Ethernet, which should allow full functionality.
