Came up with this to mount my Beam to my wall-mounted LG OLED 65" C1. The front of the beam ends up being flush with the front of the TV, so make sure you have enough clearance from the TV to the wall.

Print a mirrored copy for the opposite side. Printed with 2 walls, 15% infill.

The flange faces outwards, and should be the print bed surface - no supports should be necessary.

You can reuse the stand attachment screws to attach the mounts to the TV. The Beam uses a #10-32 x 1/2 in. Pan, Round, or Socket head machine screw.