This is a simple holder I made for the common LED Strips. You can usually slide the strips in, but you can also lay one side in, then press the other side down into the channel too install them. it has a 45 degree surface on the back so you can put it flat, or in the corner on a 90 degree bend.

As is, it is 100mm long but scaling can adjust the length and how tight it fits.

LulzBot

Mini

Yes

Doesn't Matter

With it being long, be careful of it coming loose from warping. Rafts fixed this for me.