I’m very pleased with these shelves. We bought this at the back end of last year to fit at the end of our new Tiger shed (6’x8’).  There is roughly 12” space to spare at the side in which to prop the strimmer. Relatively easy to assemble, although my son did the actual assembling with me holding the parts in place. It took two of us. We’ve left ours free standing since it seems stable enough, although there’s facility to fix it to the wall. (probably advisable if there are young adventurous children about who might try to climb the shelves!)