I think you misunderstand @Ajax123 he is saying, see what they say they are going to use then check with manufacturer's. As Alan says if you tell them what to use which is essentially you specifying the job and it fails the failure could be put at your door as you are/we're the specifier of the adhesive .
yup, understood. I don't want the blame to lay on my shoulders.
when you say manufacturer, do you mean tile or adhesive manufacturer?