It may be possible to disassemble the unit to get to the screws holding the legs to the transmitter. I wonder if doing so would interfere with its transmit strength, especially placed behind your t.v.
You have to be able to reach the transmitter easily because you must manually turn it On and Off and make selections for gain and filtering.
Can you leave it on all the time? The range should not be an issue I guess? I need it for 6m max