@David_FlorX,

With how far you are looking to extend your network, you may want to look into physical Ethernet wiring solutions that include Power Over Ethernet. PoE can naturally run 300 ft on one wire, but this can be extended by placing in-line signal repeaters. This would probably give you the most consistent connection. While it may seem like a daunting task, running a small cable under the ground may end up being much more affordable and efficient than adding an additional networking device.

The concern that I have with you adding more range extenders to the network, is the delay that will be caused by having to pass through so many points. If the signal has to pass wirelessly through that many physical interfaces, I could only imagine that there would be a delay when trying to access the camera feed.

The Mesh Technologies that are used in OneMesh is different from the Omada Mesh System. Therefore the two systems cannot be joined together to create a unified mesh system. 

  @David_FlorX,

Unfortunately, this is now above my level of knowledge. The one hesitation I would have is that laying a fiber optic line(while not only sounding expensive) would probably require a powered converter on each side of the connection.

I do not know what devices support this functionality, as this is a relative niche part of the residential market. It looks as though the inline signal repeaters can be daisy chained multiple times, depending on the standard, before it has to be extended through an external power source.