I’m sure at some point on the reflector I saw someone link to what I can only describe as “patio anchors”. Made of the same material as carabiners, it looked like you hammered them betwen two paving slabs, then twisted them 90 degrees to lock them in place. You could then tie guy ropes etc to them.
Does anyone have a link to them? After much time on Google I couldn’t find anything like what I’d seen.