The main reasons customers want an Enterprise plan are: their credits volume requirement is higher than the max Pro plan of 1.8m credits/year, they want Enterprise-only features such as SSO or pass-through tables, or they want a dedicated Growth Strategist.
Please get in touch with us by submitting as many details as possible using this link: http://clay.com/refer-a-deal. The GTM Engineering team will review your request and be in touch after to coordinate with you and your client.