I did something similar using Dexion. Anchor bolts into the brick wall,
and a couple of supports running from the wall near floor level to the
outer edge of the platform, which has Dexion around the periphery and
some of that cheap not-quite-plywood stuff in the middle.
Did this after finding that manufacturers' mounting assemblies work
only for matching washer and dryer models, meaning that if one breaks
you have to replace both.
The dryer in question is fairly light, though wet clothes would add
weight, but I don't think there's much risk of collapse.
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