Hello,
I have used wireless fences. Here is a link to reviews:
https://www.google.com/search?client...+fence+reviews
If money is no object get the Garmin 100 or Garmin 200
https://www.garmin.com/en-US/p/660805
I have the Garmin 100:
https://www.garmin.com/en-US/p/pn/010-01041-20
One feature allows you to make an irregular shaped area for your dog; you'll have to remember to recharge your handheld and the collar both both :-) but i'm sure you knew that.