I highly recommend a semi rigid extrusion !
They go on straight, and you can do it by yourself, no need to heat it up and stretch it. Bending around corners is EASY, just use heat gun and a box cutter to cut small angles out of the back side of the extrusion.
I got this one for my 23 online from a surplus place (can remember the name but it was up in the NE somewhere, not in FL). It was under $350 as I recall
Its about 2" tall and has a little lip on the bottom that you use to keep it straight.
