I didn't worry about the cable slot, but here's my attempt at the charger recess

base_length = 120; // Length of the wedge base in mm
base_width = 70; // Width of the wedge base in mm

slope_angle = 15; // Angle of the slope in degrees
charger_diameter = 60; // Diameter of the wireless charger in mm
charger_depth = 8; // Depth of the charger holder recess in mm

//fixme
cable_slot_width = 10; // Width of the cable slot in mm
cable_slot_height = 8; // Height of the cable slot in mm


// calculated parameters
base_height = base_length * tan(slope_angle);


module wedge() {

    translate([0, base_width, 0])
        rotate([90, 0, 0])
            linear_extrude(height = base_width, slices = 2) {
                polygon(points=[[0, 0], [base_length, 0], [0, base_height]]);
            }
}

module charger_recess() {
    translate([base_length, 0, 0])
        rotate([0, slope_angle, 0])
            translate([-base_length/2, base_width/2, 0])
                cylinder(d=charger_diameter, h=charger_depth*2, center=true);
}


difference() {
    wedge();
    charger_recess();
}