Dog tracking GPS

I have a German Shepherd and a Belgian Malinois and they have recently got out of our yard and went on an adventure. We were worried sick and was unable to find them for hours until our vet called and the animal control had dropped them off. Thankfully they are microchipped and had their id tags on.

I've looked at a few GPS trackers with no luck as to being able to settle on one specifically. Does any one have a recommendation? All the ones I have looked at the reviews are about 50/50.

How far do they work? I was hoping at least a mile?

Thanks for any help!
Greg