The more you know!
I try my best to inform my customers on how I would design their shower enclosure. There are many options. Hardware options, configuration, structure and safety issues. When doing a project always get atleast two quotes and compare apples to apples.
I am including a link that describes the process that I can more than relate with, and I think will be very helpful to you in making a informed decision in the purchase of your new frameless shower enclosure.