It's a little late to suggest this, but it's not a bad idea to leave your dog at a new place or with new people for an afternoon or day before leaving the dog that place for an extended period of time. I'm sure your puppy will be fine, probably less stressed than you will be the whole time he's there. If you plan to do this often it's good to start him when he's this age vs. 2 or 3 years.
We actually left him for 24hrs this past week, with a neighbor. Granted, the neighbor wasn't new to him, but it was first time without us coming home at night. He was pretty excited when I walked through the door, he had the zoomies for a solid 10mins after, lol. I think it was a good introduction for the weekend.
I agree that starting at this age is definitely better. I'm also a BIG believer that it's good for dogs to spend time away from their owners.
Luckily he is good with staying home all day by himself, granted in his kennel, but he doesn't get stressed. There has been some times in this heat that he prefers to be left inside versus come out and work with us. He will sit at the door and stare at us until we put him back in the ac, lol. Probably not the same.
So...all I can say is, if it's a good place with good people - don't stress. He'll be fine, and it's good for you to get away. It's good for HIM to learn that it's okay for you to leave. If he's really super clingy all the time, it wouldn't be a terrible idea to see if you could find someone willing to do an hour or two of dogsitting in their home, or something, so that he can learn that it's okay to be left, and that you come back. It's very healthy for dogs to be able to be left - there may come a time he needs to be left at the vet, for example, and it's far less stressful on them if they can handle that because they've been boarded before.
Just my two cents.
He's probably really only clingy in my mind, because I want him to be. The dog has zero separation anxiety, I have enough for the both of us. He spent 24hrs with the neighbor this week, and that went really well. First overnighter, and other than zoomies when I got home, he was totally normal. Ace really isn't phased by much of anything luckily. He just is a typical velcro dog I guess, but being my first time as a Doberman owner, I take it as super clingy.
I know deep down he's going to be fine, I guess just all the horrid stories I have read just makes me nervous, lol. I've become really attached to this dang dog.