Twisted pair has always worked but we never ran such over power transformers.

Links will be moderated since we get spammers with their cable companies.

As to direct bury, most will run this in some pipe. PVC schedule 80 is fine for this. Direct bury ethernet cable is costly so why do that? Also, run two while you are at it.

If you do go for direct bury look for "Waterproof tape for Underground Application"

https://www.amazon.com/Outdoor-Shielded-Direct-Burial-Ethernet/dp/B007DMIUA0?th=1 for example. Seems to be about the same price as running a pipe.