Enhance 22 Testimonial Videos

I have 22 short testimonial clips that need a professional polish before I publish them. Each video must sit convincingly on a computer-screen area inside a high-resolution office stock photo I will supply... (Budget: $250 - $750 AUD, Jobs: Adobe Premiere Pro, After Effects, DaVinci Resolve, Video Editing, Video Post-editing, Video Production, Videography, Visual Effects)