Yes, you will need to have some wires run. How many depends on which monitor you get. It doesn't matter if you have the solar package or not, it's just another input the monitor will account for.
The battery monitor shunt has to go closest to the battery so it sees all of the current going in and out. Then you wire everything else to the far side of the shunt. If you have a wire that bypasses the shunt the monitor will never be accurate since there will be an input/output it will not know about.
I suggest finding a place to put it where you can see it easily. You won't use it to it's fullest potential if it is hard to reach. I'm still trying to figure out where to put mine when I buy my Escape. I want it close to eye level when I am standing. I'm looking at every photo of a 19 I find to see where they put theirs.
There is an article on installing battery monitors that appears on several boating sites around the web. It is posted on: http://forums.hunter.sailboatowners.com/showthread.php?t=125606
among other places. If you don't DIY it will at least tell you what is involved. The article also discusses what a monitor will show you and why is is important to have it wired closest to the battery. The guy who wrote it has written a bunch of excellent articles on how to do various 12 volt projects. His web page is at Marine How To - Compass Marine - Boat Repair Free Information
and he is an active contributor to a lot of forums.
The boating folks are much more interested in 12 volt systems than RV folks are so there is a lot more good 12 volt info over on boating sites. Your favorite search engine will find lots of info if you don't restrict your search to RVs.
The Trimetric has a good reputation in the RV world. The boaters like the Victrons and the Links. There are others that are well thought of too. Prices vary widely so shop around.