I looked into the wallpaper pans and stuff early on. They just seemed so flimsy to me. I use the bucket O'StarSan to get some into the racking cane, then get it to flow inside it to sanitize. I then just spray down the outside really well with more StarSan (as needed) to ensure it's sanitized. I also get the tubing going onto the racking cane full of StarSan, connect it to the cane, and then get that StarSan to flow through the cane (more volume).
There's always a few different ways to do things it seems. IMO, as long as you sanitize what you need to, well/properly, do it however you need to. I've been known to put StarSan into a keg and blast it out of the liquid post, through the racking hardware, to sanitize it all (inside at least)...