Roku 43” TV wall mount options
From the link provided by RokuRhea-V, at https://support.roku.com/article/9943613630103 you can see the specs/requirements for 43" Select 43R4A5R mounting.
You just need to locate a bracket with your preferred options (ie. fixed, tilt, rotate, swivel, extend, etc) that includes a mimimum "vesa 300 x 300" screw pattern and can support 15 lbs.
Plenty of options on Amazon. If you see something that says Max Vesa 600 x 400, that means includes 300 x 300 and includes adjustments up to 600 x 400.
You can perform a search on Amazon for " 300x300 vesa wall mounts" and should get plenty of results to get you started.
--------
While I do not have any specific recommendations for this TV, I have used brackets similar to this one for mounting TVs (which offers full movement/adjusting that allows for easy connections behind tv since you can just pull away from wall a pretty good distance to get behind). I have mounted these on tile fireplace walls , regular studded walls, and on exterior brick/stucco surfaces. (many of these mounts will come with cheap, chinese lag fasteners so for heavier TVs I would grab some better lags/fasteners from a hardware store or at least pre-dill if you use the original fasteners.)
