Brake master cylinder connections

Hi. 

I need bit help with this master cylinder.. Which corner goes where? Tried to look on google but found so many different ways.. On the side reads 20.

you need to run opposite corners to the front hole(s), and the other 2 opposite corners to the rear hole(s). as long as you follow that rule, you can pipe them up any way you see fit

As above, "diagonal split". The reason is, if it were split side-side, it would be very funny braking with one circuit not working. And if it were front-rear split, then if you lost front brakes only relying on rears, a light FWD car like a Golf would simply lock the rear wheels but not slow down that much.