I don't think it is worth to list or get backlinks on a new directory like this, or it has less backlinks pointing to this directory. You need to find quality directories to help increase your web hosting sales but nowadays, forums can replace directories for this task.
That's a great question. The listing you have provided seems pretty good and most of which are very popular too. However, for increased web hosting sales and lead conversion, if the listing is relevant to your scope/niche, then go for it because in doing so there is nothing to lose. However, it all comes down to relevancy what conversion you may get. Often times, good directories listing might be really helpful for your prospects to find you on the web generating some level of trust to your business. Please don't just spam rather try to be relevant and useful. This way with no wonder directories listing might help you in great regard boosting web hosting sales.