The PS5 can be set up either horizontally or vertically using the included base, which converts by rotating the arm clockwise or counterclockwise.
PS5 stand explained: vertical vs. horizontal orientations, side panels - Polygon
Can You Lay The PS5 Horizontally On Its Side?
Is it better to have PS5 & Xbox Series X vertical or horizontal - AimControllers
How to Turn Your PS5 From Vertical to Horizontal (and Vice Versa)
Is It Bad to Stand Your PS5 Up Vertically? - The Tech Edvocate
PS5 console set-up – step-by-step instruction - AimControllers
Horizontal and Vertical Stand for PS5 Slim Accessories, Playstation 5 Disc Version Digital Edition Base
Reports Suggest the PS5 Might Leak Liquid Metal, Overheat if Left Vertical
Sony recommends using the PS5 plastic Base for both Horizontal and Vertical set-ups. Do you?
PS5 Slim Doesn't Come with a Vertical Stand, Needs to Be Bought Separately