The rescue that I used to be associated with would not adopt to a home that used an e-collar.
If a potential adopter (PA) had an invisible fence we asked how they trained their previous or current dog to stay in the yard. Did they use the shock? Or did they boundary train and use the tone? We would then have a discussion with the (PA) about what we allowed for use with our dogs. We would deny or end the process if people would indicate that they would use the shock. If they seemed agreeable or did not use the shock we would proceed with a home visit. Our contract specifically stated that shock collars were not allowed to be used on the adopted dog. (I realize that there is very little that we could do once a dog was placed.)
For the record, this rescue would adopt to homes without fences - we felt that the foster home would make the right decision about whether their specific foster dog would require a fence or not.
As for home visits, rescues often network for "out of area" adopters - so the person that may do the home visit could be from another rescue going on behalf of the rescue you applied with.