How to correctly configure MultiPlus-II 48/5000/70-48 x3 L1,L2,L3 and two batteries Pylontech US5000
Hi follow these manuals:
https://www.victronenergy.com/live/ve.bus:manual_parallel_and_three_phase_systems
https://www.victronenergy.com/live/battery_compatibility:pylontech_phantom
If all steps are followed system setup is done!
One point: your battery capacity is too small for this setup
this is just for starters, more batteries will be purchased later 
Yes thats possible, but remind its a battery based system, you could potentially have startup problems (inrush) when starting the multi’s
Youre probably fine, but just to help you prevent problems! 
If you understand German, or use translate you can watch this video: https://www.youtube.com/watch?v=C6oqKursyko&list=WL&index=34&t=27s
@Ton_Gans thx