We bought this to be mounted on a California king bed frame for a memory foam mattress that doesn't have a mattress foundation. The foundation wasn't required because we use a full metal wire frame. I was attempting to bolt the headboard to the brackets but because of the location of the holes, the bottom of the headboard will sit above the top of the mattress and you will see the wall behind the bed on the side ends of the headboards. You will have to modify the legs or just mount to the wall. This needs to be specified in the description. Also the California king size is the same as the king. With that said, it hangs out an extra inch on each side wich looks stupids. You'll have to hide it with a nightstand or something???? Quality is good for the price. Just beware if you have the same situation as we do. Dan