I would just run one catch can. And if you get a check valve ditch the PCV valve as it works better anyway. When I had both installed the PCV valve would make a terrible rattle with the cams and low vacuum I have.
You could run the catch can with a filter on speed density and no line to the intake pipe. The whole point of it is that there is now less restriction in front of the turbo so there will be little if any vacuum in the intake tube. Let the pressure just vent out how it wants. Have a check valve on the filter so you can still pull vacuum on it while cruising and be nice to the environment.
I'm still on a MAF but I run mine like this.
EDIT: I put this in another thread too but these are the valves I run instead of an OEM PCV valve.
click Also mentioned in the other thread is the fitting for the PCV hose on the intake manifold also threads into the valve cover to eliminate the PCV valve.