Ask HN: Pre-launch feedback Cloud Security startup

Hi, We're still building our platform but we feel we are close enough to start getting the word out. We are a team of Phds with decades of security experience but not too much SEO/Advertising background. We're aware of a few pre-launch sites such as betalist, betabound and startupli.st (seems to be down for the last hours). Any other places we should be aware of ? Thanks ! PS: I didn't post our url since I'm not sure it's allowed or advised.