I'm running the contour funs on a PWM fan speed controller as I ran out of time to get a shroud made. The e-fans work most of the time, but I found their limit while driving through OK this past August. I was running 75mph into a stout headwind with the AC on and engine temps stayed around 210-215F. Warmer than it should have been. Mechanical fan would've spooled up and pulled the temps down.
What is stopping you from running a mech fan?
@Tank5 is doing this in his 45 and ran into some clearance issues. He seems to resolved that with an Isuzu fan that bolts up.