Streaming at two locations at same tiem

Sure. Just be aware that you will not be able to receive local channels for the home (s) in GA. If you are, HOWEVER, using mobile devices like a phone or tablet then you can watch the local channels meant for Georgia on the DIRECTV STREAM app. 

how many devices can stream at the same time from both locations. 

Thanks,

3 devices can stream simultaneously AWAY from the home location

20 devices can stream simultaneously that are IN the home location