I've previously worked in a professional capacity for a very old and well run breed charity in the UK. It had money behind it and could offer support with behaviourists. What I learned through working there was that many dogs were handed in because they had challenging/aggression issues and behaviourists who can actually fix aggression or have any experience with it are expensive and almost impossible to find (I'm up North, but not in a remote area).
I've also fostered two dogs for a foreign rescue and both were promised as 'dog friendly, child friendly and cat friendly and ok around people. Three were none of those things. My rescue Frenchie nearly lost an eye and my cats are lucky to be alive. My neighbour was bitten in my home-a calm, mature lady who did nothing to upset the dog. Fortunately the charity in both instances took the dogs back.
I have a friend who is currently broken hearted who has had to put her three year old Romanian rescue to sleep last week as her resource guarding eventually escalated to biting both her and her husband. The charity could only offer 'permanent kennelling' to help her.
There are five foreign rescues I know of locally; all have issues.
In my humble opinion these dogs have evolved to survive any way they can, ie resources are precious and they guard and protect what they think they need to survive-usually food- which in turn makes them aggressive around other dogs. All problems to fix that are very very time consuming and challenging.
I gave up with foreign rescues as they dont seem to have the funds to provide backup and up got my last dog from a reputable UK breeder as a puppy and made sure she had all the health testing papers this breed required to prove my puppy was fit and healthy. She's four next week and has been an utter joy.
I'm also aware that in the next 10 years there may be grandchildren in this house and that was another deciding factor in turning away from foreign rescues. I wanted a breed that is as safe as houses with any future children. Sad - as welfare is in my bones, but that's my experience.
Think ahead for the next 10/15 years Good luck.
Ps: my charity would not allow us to rehome a dog if they would be left more than 4 hours (incl work commute)), which I think is very reasonable. Of course you can employ a dog walker but it's about £12 per hour up here at present, and anyone working full time would not be considered, which I think is fair enough.