Hi maxwestern, I used old metal shelving found on hard rubbish to allow three mowers on top of each other. Triples the capacity of one mower footprint. I've made up three of these so far.
That is on another level -excuse pun haha -can literally hold tonnes -well two anyway - of mowers with very little precious space taken up for the number of mowers you can fit. It looks safe too.
Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!