What’s an appropriate way to thank my work placement trainers?

Next week’s my second week of work placement. I want to thank those training me on work placement with a thank you card, containing a nice, personal message each and a small packet of chocolates each. I’ve already bought these.

My mum said that the card and the chocolates are a good idea, but that I should stick with one chocolate bar each with each card.

Is she right? Is a packet of chocolate each too much for each person?

What’s an appropriate way to thank my work placement trainers?
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