Ok, so it seems that installing a heavy sex doll on concrete is more complicated than using a hardware store. I don't know why I didn't think about it before, but I used Google to search for it, and it seems that it may be a bit risky depending on the situation. So I'm not sure if anyone can help, but think it's worth a try. But I hope to add more details. The concrete ceiling is located on the ground floor of a 2-storey brick house. Not sure what you would call it so it's hard to google it. The eye panels are their largest and limit the size of the bolts. Not sure if I need to find something bigger, this will require larger bolts or if using more of these eye panels to spread the doll load will help. Any help is greatly appreciated.