They do, and I'd seen it often. So I've been watching all month, and never caught even one near a corner. Contrary beasties!
But I did find one making its way over a bumpy snail shell, demonstrating the cornering technique on a gentler angle.
|Limpet on trophon snail|
The shell lifts up to straddle the gap, and the soft body slides, sluglike, from one pane of glass to the next. Or from a stone to a snail shell or to a waving blade of eelgrass.
The limpet is not really glued to the surface, unless he wants to be; then he's almost impossible to remove. I can slide one along wet glass with a fingertip, but if there's any roughness on the surface, he's stuck fast.