Ok... so i ordered ten of You are not allowed to view links.
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That link is for 50 pixels per string -- not 30.
10 strings... 50 pixels per string, 3 channels per pixel -- 1500 channels.
If you decide to enable "hybrid mode" you can also control the strings so that all pixels on that string receive the same instructions. For each string, add one virtual pixel, with its own 3 channels. With hybrid you have 1500 + (10 strings * 1 pixel * 3 channels) = 15030 channels.
Since you asked about channel count, I want you to know that these are smart strings, and use Pixelnet. (NOT DMX!)
Pixelnet has 4096 channels per pixelnet universe. So, you have PLENTY of room.