the TCL made their mounting scheme for their tv the way they made it. they do fit VESA mounts, with spacers. I don't recommend "trying to make it work" as far as the existing mount goes because you/your parents would be liable if anything goes wrong via said modification. why not get a proper mount for the tv and location. only thing I did when I mounted my tv was use 2 spacers I believe on two of the holes. those spacers came with the mount hardware.
I would recommend getting a tv mount that holds up to say 80" to allow for upgrading in the future to a larger tv. if you go to a different tv brand on the next tv, it should fit that mount just fine as long as it's not beyond it's size/weight rating.
I've mounted 3 TCL tv's in my apartment. all 3 have the same design, all 3 are using spacers on two of the four holes that came with mounting hardware and all 3 are fine with no problems.
i'm sure you or someone here will find/recommend something to you mount wise to fit your furniture/unit.
best of luck whatever you end up doing, please keep us posted.
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Last edited by solarrdadd; 08-09-2019 at 06:29 PM.