I use white LED Christmas lights, have 4 strings of them. I use spring loaded clamps to hold them to the awning. If you clamp them on before you raise the awning up high, then no ladder needed. If storm comes takes about 10 seconds to undo 3 clamps. The metal clamps grip vinyl better than the plastic clamps. Plastic will work fine on Sunbrella.
Sometimes I run the lamps and clamps over to a lamp post or tree too, other times I string up and down the awning so I have like a lit pearl necklace. Looks really cool. Also, I use a separate extension cord that I plug into the utility post. I bought a heavy duty one with 3 outlets at the end, so I can plug in laptop or fan outdoors too.
Love my outdoor lights and the spring loaded clamps make it easy to put them up or down quickly. If you go with white Christmas lights use a spool to store them on. Otherwise it can be fussy trying to deal with them.
If you are set on rope lights, then use big clamps, they don't have to clamp to the light, just use the clamp to make a channel for them to rest in, like I do the Christmas lights.