Thank you for your review and for choosing Aston. We always insist on professional contracting especially for specific scenarios like your brackets-to-wall scenario. Licensed pros have the experience and tools necessary to get this task completed. Regarding your tray, Aston also never recommends prefabricated third party brand ones or existing trays, as we can not vouch for their design/specs/engineering with our models. A custom solution through a designer or contractor is (again) usually required. We hope you enjoy the design, quality and functionality of your new NAUTIS Frameless Shower Door for years to come.