Garden play equipment on decking

[oneplustwoplustwoplusone]

Kids are 6 and 5 so grown out of our Wendy house and tiny tikes car etc. Our lawn is slightly sloped, bumpy and the foxes love digging in it. We do have a large ish bit of decking at the back. Has anyone put play equipment on decking? Would I need to put anything underneath? Or is it a non starter as it needs to be anchored down?

I was looking at something like this https://www.plumplay.co.uk/products/climbing-dome-frame?variant=44111677161645

I’d make use of the grass however lumpy it is now - you’ll be able to fix the play equipment much more easily.
It may not be just one child using at a time - you could have a couple climbing and another swinging so it needs to be fixed as per the instructions.

I don't think you could put that on the decking, how would you anchor it? It's likely that the decking would just lift and snap.

I've got a (relatively small) trampoline on a deck at the bottom of the garden, and that seems OK. Also have a mud kitchen and water table.