You'd have been better moving the sensors slightly up than down to fit in the space under the crease. The installers should have known they wouldn't work there even if you didn't.
I have a how-to on the OEM valance if you search for it.
"We are all born ignorant, but one must work hard to remain stupid." ~Benjamin Franklin
2012 Kona Blue Mustang GT
Roush Phase 2 625HP Supercharger | Black OTT Stripe | 400A | 5.0L | 6MT | 3.55 | HID | SP | CP | BBP | EP | RVC
Mods: Forget it .... too much to list!