Are these flat or 3 dimensional?

3 dimensional. I filled them with small rocks so they don't blow away.

Will these work for chupmunks in my plants?

Probably not, mainly for birds they have helped inside my barn. You need the ultrasonic solar repeller, they work wonders for little critters. It senses little critters and you can set it to the owl noise to scare them off.

Brand	Kungfu Mall
Model Number	83XH OwlDeterrentB5
Color	Angry Owls 5pc
Product Dimensions	1.7 x 17.6 x 29.69 cm; 68 g
Material	Plastic
Item Weight	68 g

Owl to Keep Birds Away, 5 Pack Bird Scare Owl Fake Owl, Reflective Hanging Bird Decoration, Dual-Side Printed Owl to Keep Birds Pigeon Away from Patio Garden

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