My answer to both questions is no.
He would be a 3 month rental with an huge price tag.
First off, Liberty is cheap, they will never sign a FA who will command what he will.
Second off, he likely wouldn't seriously consider signing with Atlanta anyway. The Braves were briefly a destination team in the 1990s when Turner was the owner. Never beforeor since has any Atlanta teambeen such a FA draw, and maybe never again.
Third off, I like the nucleus this team is building, but it's at least a year away and my guess is it will be the 2020 season before the team is mature enough to have a sense of where to invest in a big FA contract.
What they MUST DO is sign a couple of good and durable relief pitchers before the deadline, if they don't, this season will continue to go downhill and young arms will suffer.