I agree Kenlowe is delivering a good solution for high performance fans.
I used the high performance Kenlowe fans twice – in both cases the two speed fans with external adjustable electronic control box (and easy to install temp.-sensor)
Both cars had heat problems: a replica with a 502 cui Chevy and my AK 1073 powered by a 460 Super Cobra Jet engine.
In both cases the fan is behind the radiator combined with a shroud. In both cases the second speed finally has been never used.
The fan even sucks air out of the corner, as there is enough space between the fan and the radiator.
Did a test with cigarette smoke :-)) in front of the radiator.
Here the radiator installation for my AK 1073