Mounting base

FIG. 1 is a front, left, and top perspective view of a mounting base showing our new design;

FIG. 2 is a rear, left, and bottom perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a top plan view thereof; and,

FIG. 9 is a sectional view thereof.

The broken lines in the figures are included for the purpose of illustrating portions of the article which form no part of the claimed design.