Thanks everyone, super helpful. Since I need to get out this survey today and only have 114 people I'm sending to, will just ask for email addresses in Survey Monkey and manually send the unique codes when I get responses.
However, will work with the team to evaluate the better premium survey option...QuestionPro, Cvent (Yes, Steve, would be great to have an intro..thank you!), and Wildfire. I'll update when we decide.