My builder uses Houzz Pro to plan the timeline and give detailed estimates and daily updates with photos of progress, and provide invoices at pre-agreed key points in the build. This made the whole experience much more efficient and stress-free.
While we do not sell anything that keeps the cushions from sliding, many of customers have stated that using grip drawer liner under the cushions helps. You might try searching for "bulk grip drawer lining".
Design Furnishings