I think there is no zero percentage house edge gambling sites are there. Because it is not worth for site owners. If they give 0% house edge then why simply they invest a lot of money to create sites, it is no use. Safedice site I don't have any idea about this site. Let me check once and later I will share my experience. But I think there is not 
I think that that there may not be a single casino who are not getting any edge, because thay have to run the casino and for that they have to keep some edge, but the edge should not be a big one, so that gambling can easily visit your site and use it for playing gambling.