Cat Palm and Red Sister Cordyline poisonous to cats?

I just recently purchased two house plants, the Cat Palm and Red Sister Cordyline, but I cannot find any information on if they are poisonous to cats. I have three indoor cats so I'm concerned about their health if they end up munching on a few of the leaves. I have looked at lists for both poisonous and non-poisonous plants to cats and these two are on neither of them. Also if anybody has any advice for keeping cats from eating houseplants that would be extremely helpful. Thanks!