Muddymike has brought this to us :
Its biggest fault is the angle at which it stands up. Its just too vertical
so that the slightest touch sends it tumbling.

For similar problems, I find using one of those cheap plastic, hinged
display stands for plates work well. For wider items, I find them still
useful, by breaking them at the hinge and spacing them apart with tube,
threaded rod and nuts. The cost a £1 for several different sizes in
pound shops.