An assembly adapted to support panels, arranged in a plurality of rows arranged side by side, said rows each extending from a lower end to a higher end along a longitudinal direction inclined with respect to a horizontal plane, each row comprising: - two longitudinal profiles extending from said lower end to said higher end along said longitudinal direction and sideways bordering said row; - a plurality of transverse profiles extending between said two longitudinal profiles along a transverse direction transverse to said longitudinal direction, - when mounted, a plurality of said panels, arranged sequentially along said longitudinal direction, and supported: - between said two longitudinal profiles at both opposing longitudinal panel edges (22, 24) extending along said longitudinal direction, and - between two of said transverse profiles at both opposing transverse panel edges (26, 28) extending along said transverse direction, and wherein: - said longitudinal profiles comprise a panel support structure at each side facing an adjacent longitudinal profile, said panel support structure comprising a U shaped cross section comprising a vertical base and legs (46, 48) extending in the direction of an adjacent longitudinal profile; - said panel support structures are configured such that said panels can only be added to said row by sliding said panels along the longitudinal direction with both opposing longitudinal panel edges (22, 24) respectively enclosed by the corresponding panel support structures of the two longitudinal profiles bordering said row; and - said transverse profiles comprise a panel support structure at each side facing an adjacent transverse profile, said panel support structure comprising a U-shaped cross section comprising a vertical base and legs (56, 58) extending in the direction of an adjacent transverse profile; CHARACTERISED IN THAT - said longitudinal profiles further comprise a profile support structure arranged below each panel support structure, said profile support structure comprising a U shaped cross section comprising a vertical base and legs (66, 68) extending in the direction of an adjacent longitudinal profile; and - said transverse profiles comprise, extending at both opposing ends (72, 74), respective extensions (76, 78) configured to be respectively enclosed by said profile support structures of said two adjacent longitudinal profiles such that said transverse profiles can be added to said row by sliding together with said panels along the longitudinal direction during mounting. - two longitudinal profiles extending from said lower end to said higher end along said longitudinal direction and sideways bordering said row; - a plurality of transverse profiles extending between said two longitudinal profiles along a transverse direction transverse to said longitudinal direction, - when mounted, a plurality of said panels, arranged sequentially along said longitudinal direction, and supported: - between said two longitudinal profiles at both opposing longitudinal panel edges (22, 24) extending along said longitudinal direction, and - between two of said transverse profiles at both opposing transverse panel edges (26, 28) extending along said transverse direction, and - between said two longitudinal profiles at both opposing longitudinal panel edges (22, 24) extending along said longitudinal direction, and - between two of said transverse profiles at both opposing transverse panel edges (26, 28) extending along said transverse direction, and - said longitudinal profiles comprise a panel support structure at each side facing an adjacent longitudinal profile, said panel support structure comprising a U shaped cross section comprising a vertical base and legs (46, 48) extending in the direction of an adjacent longitudinal profile; - said panel support structures are configured such that said panels can only be added to said row by sliding said panels along the longitudinal direction with both opposing longitudinal panel edges (22, 24) respectively enclosed by the corresponding panel support structures of the two longitudinal profiles bordering said row; and - said transverse profiles comprise a panel support structure at each side facing an adjacent transverse profile, said panel support structure comprising a U-shaped cross section comprising a vertical base and legs (56, 58) extending in the direction of an adjacent transverse profile; - said longitudinal profiles further comprise a profile support structure arranged below each panel support structure, said profile support structure comprising a U shaped cross section comprising a vertical base and legs (66, 68) extending in the direction of an adjacent longitudinal profile; and - said transverse profiles comprise, extending at both opposing ends (72, 74), respective extensions (76, 78) configured to be respectively enclosed by said profile support structures of said two adjacent longitudinal profiles such that said transverse profiles can be added to said row by sliding together with said panels along the longitudinal direction during mounting.