I have to agree with Eric (Palustris) regarding the deterrents.
We also tried several different methods, including sonic devices with no success. I actually got a full refund on the 'humming' (sonic) types that we purchased as they did not perform as described by the manufacturer.
I have seen several molehills beside very busy roads in different locations around the UK, which seems to dispel the claim that sonic devices are a deterrent. They just get used to noise and vibrations from traffic, making this method a non-starter as far as I'm concerned.
I never got a definite answer to solve our mole problem, so unless something has been produced since then or another solution discovered, I'm afraid they remain a big problem to gardeners keeping their lawns in pristine condition.