This one would not be too helpful if your dog actually ran away because of the range being too small. Like others have mentioned though, training and being careful are much better options than getting a GPS tracker so you don't have to worry about it.
Being able to track your dog won't necessarily keep him from harm. For example it doesn't take very long to get hit by a car. Also he's at a prime age for people to want to keep him for themselves if they found him loose... removing a collar would not be difficult.
That being said I have new a rescue dog who is extremely shy/terrified-of-strangers and very flighty. If he ever did get loose, the odds of anyone being able to get near him are very low. So I have looked into long range trackers to have in addition
to tons of daily training and always
extra safety precautions. (Especially because being a GSD/Husky people are always mistaking him for a wolf!)
A 2 month old GSD raised and trained right should not have these issues. Its a perfect age to use a long line and work on recall.
Definitely crate the pup or have him in an ex pen if he's loose in the house unsupervised with young children who may leave a door open. At 8 weeks, being unsupervised while having free run of the house isn't a great idea already.
But anyways, I haven't been able to find any that would be effective for a dog that has gone very far out of sight. One tracker called TAGG used to be good but then got bought out by another company recently and is not very functional anymore.