They should be upright so they can take in the most light they can, but on the other hand you dont want to keep moving them and stressing them out. I would see if there is anyway to keep them upright though.
I solved your exact problem by purchasing a plastic clam holder from
an online vendor out of Dallas, TX, who name I have forgotten.
<img src="http://reefcentral.com/gallery/data/500/10088MVC-039S.JPG">
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