Survey best practice for surveying when customer has multiple product lines?

We have a survey that asks clients for product specific feedback. It starts with asking the product the client uses and assumes the client is answering the questions for that product. The problem is many times the client self-selects the wrong product or they will select one product and provide answers for another. We use Relationships for each product line, so ultimately this is impacting R level scores. I have a few ideas but thought I’d throw this out there to see if anyone else has had success with a particular strategy. Any suggestions for survey best practices? Thank you!!