A proxy top list site is an old school way that proxy webmasters to promote their new proxy web site and make them well known to the proxy users. The concept is very simple and usually those sites are based on the same script. All that the proxy owners has to do is to create an account on those web sites and complete a simple web form with a couple of information about the proxy site that he/she wants to promote. Once he does that, he then have to place a html code onto his proxy website and that's all.
Depending on the proxy top list's configuration the ranking on it can be different. Some of them rank first the proxies websites that have the most pages views. On the others hand they will rank first those that have the most clicks from the top list to to the proxy website. Last but not least there are others that rank first those that have the most votes coming from the proxy website to the proxy top list.