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Seems to do well just with drywall anchors (included). I've been tweaking the design (setting the holes up to allow more of the screw to protrude through the part).
Here are some pictures. White and green don't appear (temporarily out; waiting on filament from Amazon...).
The lump is the UMC. We'll have a holder for that, too, shortly! In our garage our 240V outlet sits fairly high off the ground, so we've never had to worry about the lump hitting the floor. It just dangles.