You could also just get an ethernet powerline adapter and not have to worry about wifi signal.
I’ve looked into those as well, issue seems to be to work best they need to all be on the same leg. Circuit breakers can also jigger with em. Least that was my take on em after reading a LOT of reviews.
Personally I’m gonna get around and bury some conduit to the boiler, then from the boiler to the shop. Next job thats close to me and when we can do it on a weekend I’ll just rent a trencher for the weekend.