Daniela,
Any photography store catering also to the professionals will carry all kinds of grip equipment that you can use for this purpose, like clamps, articulated arms, ball jointed mounts, etc. Just need to use your imagination a bit and make sure it is firmly in place. I'd recommend you go personally to one such store and let a knowledgeable sales clerk know about your exact needs, he/she will probably be able to help. Just be warned that quality stuff like the Manfrotto pro-clamp is kinda expensive, and you don't want low quality gear for this.
Best,
Roberto.
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