Were Im from we do not have meny hornet (not see one in 50 years) just as well as they seam like nasty bugs. On the net there are a few traps you can make for not much money I would give that a try and see if you can find the nests and destroy if over winter as this will be the time they are dorment, see link.........dave

https://pests.getridofthings.com/get-rid-of-hornets.htm