On 20/02/2021 17:15, JohnP wrote:
What fixing do you recommend in a plasterboard wall there it is not
possible to tighten the screws as the item need to slot onto it with
keyhole slots?

Is this 'spur' shelving, or one of the copycat products ?.

These are intended for heavy loads. Plasterboard won't
support it.

I once bought some element32?? uprights because they were
cheaper than Spur, but although the spur brackets would fit
into the slots, the depth of the non-Spur upright was less
than a proper spur upright, making it impossible to move the
upright down to the horizontal position without munging two
gouges out of the plaster.