Usually, when doing jigsaw puzzles, you have 2 options :
This small tool will hold your lid at 30°, being stable and saving you sapce on your desk.
I got the idea watching the (great) @karenpuzzles on youtube during her world speed puzzling championship.
Print with the biggest surface down, no support is required.
Tested with 500, 1000, 2000 pieces puzzles from Ravensburger.
EDIT:
The author marked this model as their own original creation.