The sockets on the back of my XPS and 250 are only a foot from the wall sockets, which has meant that the Powerlines are coiled beneath the stand. It's a very loose coil, but there is little alternative. I did find that any coiling of the SL speaker leads needs to be avoided, so I have the one from the right hand speaker running away from the speaker then back again, as it says in the instructions. If I were to run the Powerlines in a similar fashion, they would get in the way of the speaker wire, so really it's a case of the lesser of two weevils, as they say in Master and Commander.
I have made one small cable tweak today though: ever since getting an SL din to XLR it has just touched the top of the carpet pile, despite my getting longer legs for the rack. Today, while dusting, I thought I'd check whether I could raise the spikes on the SVT's bronze spikes, and was very pleased that it's indeed possible. There is now a clear gap between the cable and the carpet. It may or may not make a difference, but I find it reassuring that there is a clear gap when I know there 'should' be.
My system is much less prone to slight setup shortcomings than the bigger system I used to have, but it still makes sense to get the best from it.
I noted Ryder's comment above about everything being a mess behind the rack, and all I'd say is that it's an ideal time for Spring cleaning and a good tidy up.