FWIW - I worked as a kennel attendant at a vet clinic for a few years and would avoid leaving my current/future dog(s) at such a location unless it was an absolute emergency.
Here's why:
Unless there was an emergency with a dog (such as the time that a dog in boarding had a seizure and was brought to the "treatment" area for further monitoring), the dogs were basically cared for by high school students working for minimum wage with varying levels of actual interest in the field. The dogs were kept in kennels that are just big enough for them. Panzer is big enough that he would have pretty much guaranteed himself a spot in a run versus one of those metal vet cages, but the medium-large sized dogs had it the worst. On non-busy days, a medium-large sized dog would likely get to stay in a run, rather than a large cage. But if there were enough extra large dogs to fill the runs (which were about 2 ft x 4 ft), the medium-large dogs would get bumped into large kennels which were no bigger than a dog crate. The dogs got walked by the high schoolers 3x per day for a few minutes each time. Really, enough time for the dog to pee and poop and then back inside. The outside walking area was not fenced and bordered a large road. One time, a dog got loose of its slip lead and the vet staff had to catch it as it ran, panicking near this large road.
If the client paid extra, his or her dog would be given one or two "play times" per day for fifteen minutes a piece in a small fenced area. This was nice, but even with the max number of "play times" each dog was living in a crate sized space for roughly 23.25 hours of the day (I'm assuming 2 15 minute play times and 3 5 minute walks). Most owners did not opt for "play time" and so their dogs spent about 23.75 hours in a crate per day.
The kennel was extremely loud and for as often as it was scrubbed and cleaned, there would inevitably be a dog or two who would soil itself regularly, leading to a distinct doggie smell in the back.
And this was not a bad clinic. The vets were knowledgeable, the kennels were each cleaned three times per day (or more if the dog used the bathroom in the cage), the cages and runs all had solid barriers between each dog, kennels and cages were sanitized with a steam cleaner between each animal, and each animal had constant access to water and would be fed according to the owner's specifications. But the sheer stress level of the dogs must have been through the roof. You will never be able to create a full-proof scenario in which there is no possibility of something happening to your dog. This is life. Things can happen.
And so I got to thinking... if I had to decide between a slim chance of something happening to my dog at home, but her being unlikely to be stressed beyond the fact that I'm not present vs. a slightly slimmer chance of something happening in a controlled kennel environment, but her almost definitely being terrified and anxiety ridden, I'd pick the former in a heartbeat. Chances of something happening are slim in either case. Stress is almost inevitably significantly lower in case one than in case 2... AND in case one, I get to pick who is actually caring for my dog...
Things can happen anywhere. If I were in your shoes, I'd be inclined to have a professional sitter come and live at my house for a few weeks. That way, if something happens (god forbid), the dog is near home rather than in a totally novel environment. Likewise, his normal routine is maintained as closely as possible.
If I HAD to pick a kennel, it would be a small privately owned kennel where the owner takes care of the dogs themselves and does not employ staff.