The ornamental design for a salesdisplay mount, as shown and described.
1.1: Front
1.2: Top
1.3: Bottom
1.4: Left
1.5: Right
1.6: Front
1.7: Perspective
2.1: Front
2.2: Top
2.3: Bottom
2.4: Left
2.5: Right
2.6: Front
2.7: Perspective
The claimed design is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.