A:AnswerWhile it is possible, it may not be advisable. You will need to bring it closer to the outer edges of the TV so it stretches out more and the addressable LEDs may not match your TV zones properly.
A:AnswerThe 55" TV strip is 85.2"
It's not "officially supported but measure around your TV to see how much room you have. My 49" LG should fit this no problem.