Not sure about the firring strips, our house (2013 vintage Gardenia block construction) has metal studs, I installed a ~4.5 foot strip of plywood across 3 studs with 3 or 4 screws in each stud location. I then used this for the TV mounting hardware. You never see the wood as the TV is 75 inch model, and this mounting has been used for 2 TVs.
__________________
Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
|