Just got a 2023 Silverado Custom Trail Boss. I didn't notice at the time but doesn't have the factory trailer brake controller, does have the tow package. I've ordered the Curt Spectrum, looks like an easy install except: The cover where the oem controller goes, as I understand, pushes in and not pried out. It appears to me that I need to remove considerable amount of trim to access the back to remove. I have seen videos where folks have scarred it up pretty good and I would like to avoid that. My question is, can the holes just be drilled to mount the spectrum with the cover in place and just chase the harness thru the hole? I know there is a dummy connector but does not appear to be in the way. Thanks