Which would mean I wouldn't need these two Ubi's, right? I'd just hard wire it to the Pace?
I think I'm getting the impression that at best this is not going to work very well.
Although I will have to get someone else to trench for me, I do think that is the better solution.
How deep would that trenching need to be?
A simpler and reliable setup would be to use a point to point wireless bridge from your residence to the cottage if you have line of sight.
ie 2 nanostation AC locos (https://smile.amazon.com/Ubiquiti-NanoS ... anostation
One would be connected to your router via an ethernet cable aimed at another that would be set up at the cottage. The two units create a wireless link and on the cottage side there will be an ethernet output that you can connect an access point like the AC Lite LR you have.
So in this case it would be:
Pace --> Ethernet --> PoE Injector --> Nanostation 5 Ghz @ House --> (wireless bridge) --> Nanostation 5 GHz AC @ Cottage -->ethernet --> Poe injector --> ethernet --> (switch?) --> ethernet --> poe injector --> ethernet --> AC Lite LR