The ornamental design for an angledhook for sliding mount in channel rail, as shown and described.
FIG. 1 is an upper right side perspective view of an angled hook for sliding mount in channel rail showing our new design;
FIG. 2 is a left side elevation view thereof; the right side view being a mirror image;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a front view thereof;
FIG. 6 is a back view thereof; and,
FIG. 7 is an environmental left side view of the angled hook for sliding mount in channel rail with the broken lines showing the channel rail being for the purposes of illustrating environment and forming no part of the claimed design.