Almost every needlework stand you see uses some sort of clamp to hold your frame. It could be a rectangle of metal or a clamp with one or more screws, but the idea is the same: the clamp holds your frame in position.
It doesn’t have to be this way. Just a Thought makes stands where you put your frame on top of the holder.
It’s an immensely cool and useful design.
I am very intrigued by these.