Hi Ruben ,
Why is it required that each should be performed at the same time . There could be port issues with multiple SUM on the same server running parallelly . You can upgrade the BW system first ( as portal depends on it ) and after its completion upgrade the Portal .
The saphostagent should be running under sapadm and this could be another potential issue .
Lets also wait for some expert comments from other members . But my suggestion would be try running only one at a time
Thanks ,
Manu