I can't tell from the picture. At least it has the tripod fixing screw on the right-hand end, which is where it would need to be for a P or L. There was a different model (which I have) for the V-T/VI-T, which has its tripod fixing screw on the left-hand end, as required for these models.
The only potential kicker is that older bottom-load Canons also had the tripod socket on the right-hand end, so conceivably this might be for one of them rather than the P. The fact that it doesn't have a model marking on it (mine is marked "Camera Holder V-T") provides a slim suggestion of evidence that it's for the older models, before they had to start producing different versions of the holder.
This is all guesswork, but it'll give you something to mull over while we wait to hear from someone who knows for sure...