Our daughter has a M&P cotbed, that is now converted to a toddler bed which has wooden slats. This bed rail does not sit well on the bed base as it is too large. If you can live with the fact that the poles lying beneath the mattress lift the mattress a little away from the bed base it's fine, except it also is likely to mark the edge of the wooden bed frame.
We used the rail on a single bed whilst on holiday and it was ideal, so we will probably just leave it at Grannies from now on.
We only used it for a week or so anyway.