So I've come up with something (and no doubt others have thought of it too) to help keep the Wii Sensor-Bar in place without it skewing to the left or right (like it does on my TV).
By using a rubber band the friction between the rubber and the Plastic of the TV will keep it perfectly straight, and the good thing is that rubber bands are incredibly cheap, 5,000 rubber bands are approximately $3.50 (about £1.75)!
The band I use is quite small, I'm not sure about the difference in using a bigger rubber band.
The mod is simple to apply, just stretch the rubber band around the Sensor Bar, just behind the glossy sensor bit and Violá! you've successfully applied the mod.
It should look something like this:
After that, just place it back on your TV, and it should stay in place and not slide around on a point.
Example:
(note how the wire curves off to the left, without a rubber band, the bar will usually askew coinciding with the position of the wire)
And there you have it, a cheap and easy mod that doesn't look terrible (like Azuritereaction's Sock Mod). I personally really like the red stripe that my bar has now, not too sure how others will look though, beige isn't the greatest colour in the world.
P.S: I have a tiny TV :'(, it's the only size that will fit on my desk without having to move my computer's screen (which is just as tiny)