I've been looking at these online and it is hard to tell how they attach to the bed. Some seem to clamp to the mattress and some mention straps that go under the mattress.
The reason I ask is that we'll soon be staying with my parents where ds, 2, will be sleeping on a camp bed in our room. It's one of those things with a metal frame and springs across, with a thin mattress. He's been in it before and sometimes falls out (it's not high off the ground, but it wakes him and us up), so I was wondering whether a bed guard would work. If anyone has used one, can you say whether you think it might fit on this type of camp bed? Or has anyone done something similar?
I've also tried ds on a mattress on the floor and he also rolls off that and wakes up, so I need to contain him somehow. He's too big for a travel cot.