Ask before ordering. It is much easier than unpicking a wrong order.
WORTH ASKING
Whether a plan supports the number of sites you have Whether a specific application or framework will run Whether a PHP extension you need is available Whether an extension you want is eligible for you to register What the renewal price will be, as opposed to the introductory price Whether migration from your current host is straightforward Whether your expected traffic fits the plan
HOW TO ASK
Open a ticket in the Sales department. Describe what you intend to run, roughly how much traffic you expect, and anything unusual about the setup.
WHAT WE WILL TELL YOU
Honestly whether a plan fits, including when a cheaper one is sufficient or when shared hosting is the wrong environment entirely. Selling you something that will not work creates a support problem for both of us.
WHAT WE CANNOT TELL YOU
Whether your business will succeed, or how your specific application will perform without seeing it. For unusual requirements, a short trial on a monthly cycle is often the practical answer.