A:AnswerThe short answer is yes, you can mount in on your knee wall.
Rocketfish built a great wall mount. It will mount anywhere if you know what you are doing. I mounted to my garage. It worked great!!!
A:AnswerI mounted a 55 inch Sharp in the corner in my bed room that I extend and angle to watch the TV. I push it back in the corner so it is out of the way when not in use. Not sure about your TV but I also have another Sony 65 inch TV mounted in my basement on a Rockfish. The mount does not seem to be specific to any brand of TV.
A:AnswerTools needed: Measuring tape, pencil, level, drill, phillips screwdriver, socket wrench with 1/2 " socket or adjustable wrench, tape. - For Wood Stud Wall: Edge-to-edge stud finder, 7/32" (5.5mm) wood drill bit. - For Concrete or Concrete Block Wall a Hammer and 3/8" (10mm) masonary drill bit.
Please check the documentation available on rocketfishproducts.com/pdp/RF-HTLF23/6353060
David M. - Rocketfish Support
A:AnswerThey do sell a very nice RocketFish universal mount that works for that. I have 2 of them in my home. I just do not suggest RocketFish for the 75” tv’s.
A:AnswerYes, you will just need to install the brackets that attach directly to your TV horizontally instead of vertically. The Mount does not rotate to portrait/landscape, so whatever you set it up as during install is how it will need to stay unless you take it down and reposition the brackets.