mine seem to use flatter hides more than the taller half-circle kind. I a big piece of bark that I found in my yard(I cooked it in the oven to kill parasites) I have another hide that is made of sticks wired together and it can be bent in to the shape you want it. I have another hide that is just a lid from a storage container that lays across two bricks. lots of stuff can work.
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My menagerie
1.1 Ball Pythons
1.0 Amazon Tree Boa
1.0 Corn Snake
1.0 Dumeril's Boa
1.2 Bearded Dragons
2.1 Crested Geckos
2.1 Sudan Plated Lizards
0.0.5 Eastern Painted Turtles
1.2.5 Eastern Box Turtles
1.1 Eastern Red-spotted Newts
1.0 Northern Mockingbird
0.3 Chickens
2.0 Cats
1.1 Ferrets
0.1.4 Wild mice
0.0.35 some kind of goldfish