TV mounting: forget the stud finder you saw on YouTube
Most TV-mounting advice online is written for North American timber-frame houses. UAE apartments and villas are built differently: exterior and structural walls are concrete block or poured concrete finished with plaster, while many internal partitions, especially in towers built after roughly 2005, are gypsum board on light-gauge metal studs. A timber stud finder is useless here. The professional method is a knock test first (block sounds dead, gypsum sounds hollow), then a magnet or metal-stud detector to map the studs at their usual 400 or 600 millimetre spacing.
Good workmanship shows in the details you can check yourself: the TV sits level (put a spirit-level app on the top edge), cables run through a trunking channel or in-wall conduit rather than dangling, the mount's locking screws are fitted so the panel cannot be lifted off by a curious child, and the technician does a firm downward pull on the bracket before hanging the screen. Budget 60-90 minutes if cable concealment or a soundbar is involved.