I used two 4 x 20mm machine screws (M4 I think) (the one on top of the box) and nuts from this little variety box I purchased from Home Bargains/LIDL/somewhere for ~£2. You can use longer screws (40mm/30mm) but they might stick out a little far behind the stand which might be an issue if you want this right against the wall. 20mm *just* fits but 25mm long might be optimal. Don't even need spacers/flat washers if you just use an additional nut to hold it in place, but I used about 9 flat washers I bought from Homebase years ago to keep the charge mount the correct distance away. The 2 wall mount holes on the Dreame V9P charger line up correctly with the stand, it's just the accessory arms which stop it from fitting flush, which is why I thought it's worth trying to get it to fit.
Are you able to share details of what length/size screws etc you were able to use instead and where you bought them from? I figure they'll have to rather longer screws?
Very impressed. Good quality heavy metal, looks smart against Dyson grey colours.
Cheers, just ordered for £19.14 as above
Avoid if you have the Dreame, doesn't fit as mentioned. I managed to make it fit by using some washers and screws but it is not compatible otherwise.