We have the US Gear Unified brake system that is much like your Invisibrake and on our Terrain (1st cousin to your Equinox) I install the unit under the dash board on the passenger side. Pulled back the carpet and bolted the unit to the floor pan up as high as I could get it. Ran the cable (and wires) back over to the drivers side and recovered the unit with the carpet.
Never know it's there nor can you see it.
Hope this helps
Ron
Ron & Sandie
2013 Tiffin Phaeton 42LH Cummins ISL 400hp
Toad: 2011 GMC Terrain SLT2
Tow Bar: Sterling AT
Toad Brakes: Unified by U.S. Gear
TPMS: Pressure Pro
Member of: GS, FMCA, Allegro
RETIRED!! How sweet it is....