I typically trap them using the simple water trap and meat trick. To get the numbers down in the nest.
Then I spray ground hornet spray. it foams and spreads nicely.
Then I put the propane torch to them.
Then dump water in the hole with soapy water.
Then gas them.
Then put a hamburger meat and poison bate station out to get the stragglers
It’s a long week, but I kill them all and let god sort them!