A guide suitable for getting ledstrips around a 90 degree inside corner. Especially useful for cabinet lighting, if the LEDs are mounted on the back instead of on the cabinet side walls. 

The base is flexible so it can adjust to the surface and the angle can be precisely set to 90 degrees. My recommendation is to first attach the ledstrip to the guide, and then the guide to the TV or other surface. This way the ledstrip can be set in the desired angle (90 degrees or slightly different than that if wanted)

Suitable for ledstrips up to 15 mm. Bigger is possible but it will stick out a bit from the print. Use double sided tape to attach it to the surface. I have noticed the foam tape works best, as it adjusts best to the shape of the surface if it is irregular.