For your corners you can purchase "corner/elbow connectors" You cut each corner at the contacts and attach the cut ends of the LED strip. I've had bad experience with slight bends in my strips, seems overtime to cause some damage to individual LEDS. You can also try Ambient Sync lighting which sync the LED colors to the content on the screen. I have a few videos on my channel if you're interested in seeing what it looks. Subscribed.

Great video! 👍🏻