Drill holes into grout using 5/16 Masonry bit

Install anchors to accommodate a #4 or #6 screw
(Use plastic, headless anchors, preferably white)

Put a thin bead of clear silicon adhesive on track
or on the surface where track will be attached

Put track into place

Drill pilot holes through track at anchor position with a 3/32" drill bit

Use a #4 or #6 x 3/4" stainless steel pan head or flat head screw