Question about Palram Hybrid

Have it no foundation

Our situation is about the same as Moe86's. Our greenhouse has also survived all the storms since Christmas 2019. Only once did it tear away the window. The wall inserts crackle quite loudly in the wind.

I don't think it is possible to give a definitive answer. the foundation is probably the most important factor.
Our greenhouse is in an exposed position on a roof terrace, and withstood the spring storm 2020 "Sabine" with gusts of wind well over 100kmh without any problems. However, the panes are a bit loose in the frame and bend through, causing quite a lot of noise.

I don't know the maximum wind force, but it has strong gusts of about 100 km/h this spring (according to the Meteo warning).