Is there a set rule on how far or close you should mount the compressor?

I know your idealy ment to mount it so discharge is is in the path you want/need but is there any other reason?

400mm is the fan size and will move plenty of air, i hope!

As you look on at the condenser my input and out put are on the right so i will place the comp on the left as i will run a DSHC. I want to put the comp on the right hand side of fan so it gets a really good flow of air over it as i know it's going to maybe run hotter than normal due to the setup i'm going for.

How much distance should i put between the fan and comp then?

Again, sorry for all my questions