My suggestion would be to try to measure where the hot spots are under your bonnet.
Then fit vents to these spots. the air passing over the bonnet creates a sucking effect with will draw the hot air form your engine bay increasing cooling.
Bonnet scops purely for looks are ghey.
I'm trying to fit one to my late 80s subie with WRX motor fitted & was avoiding the WRX version because of all the tossers with them on their Excels & Festivas.