The visiting team at Atlanta’s place is tough, because there’s little to no access for them coming into or leaving the park. They ride the bus into the area behind the stadium and at best you can see the guys coming off the bus and rushing off to the clubhouse. Sometimes you get lucky and can catch a guy leaving early, which is a pretty likely chance given the Astros train just down the road, in that area behind the stadium where the Braves leave, but it’s really a crapshoot. Your best bet is to go down the line like you would at any game and hope guys sign. One nice thing on that side is that the bullpen is right there by the grass seating area, so you have a lot closer access to guys and the pitchers and catchers that come over there are a lot more likely to sign. Also, after a guy has left the game he has to do his running, so there’s a chance if you’re out in the first bit of the grass to get him to come over on his way in for the day. (Though I do kind of remember them being very strict about folks getting too close to the rail during the game.)
On the bright side, the Astros’ park in Kissimmee is one of the best in Florida for autographs. You just go down the third base side all the way to the end where their clubhouse is and hang out all game. You’ll get a ton of guys before, after, and even during the game when they come out. So even if you can’t get much in Orlando, you should do very well with your Stros in Kissimmee.
Have fun!