Plants I would recommend are pothos,ficus, draceana and a few others. Typically as long as it’s not poisonous it’s safe. I get all my plants from the Lowe’s near my house.
When I got an automatic mister my chameleon hissed at it and got all dark. I assume they are just freaked out at whatever new thing they see. If it your basking spot was too hot, your chameleon would most likely avoid it not hiss at it. Just my guess.