I ran across this website for amiibo fans and they had a good idea for figurine displays. They reference a few types and link thru Amazon for purchase. I googled "Copco Non-Skid Cabinet Organizer" and easily found some thru Bed Bath and Beyond for @$7.99.
The third and 4th versions showed: the clear plastic ones stands out to me. (For reference the smaller: Azar Displays Three-Tier Counter Acrylic Step Display, Item: 323057, Model: 326046) You can put Skylanders on the top but it also looks like you could put perhaps 2 rows of Skylanders underneath depending on the size you get. I'm sure most Gaints would fit given the dimensions, maybe the variants of the one's above! That's almost doubling the number of Skylanders stored on the same shelfspace!!
Good Displaying:
Copco Non-Skid Cabinet Organizer
It may seem odd, but these Cabinet Organizers from Copco make fantastic amiibo figure stands!
The 15-inch model has enough space for 18 amiibo figures and there is a smaller, 10-inch model available if you don't need quite as much space.
Both models are inexpensive and are highly recommended!
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Link to the Amiibros.com page:
Link to Bed Bath N Beyond for the same thing:
Link to the smaller clear plastic one I like thru Staples (It shows a set of 2 for @$19, found em on Amazon at varying prices)
For reference: Azar Displays Three-Tier Counter Acrylic Step Display, Item: 323057, Model: 326046