The current thread on hydraulic valve options shows a nice arrangement for the 4100 with power beyond mounted on the lower ROPS. That location would also work for the extra valves. It is nice have the lines centered but you can always route them that way. This is probably more important if you are in brush doing clearing work. I had the dealer install my setup so I've not paid much attention to routing details. They've been pretty knowledgable about it and always welcome me to discuss any concerns.