How do I drill holes for metal bar to hang grill

Buy a foldable table to put the grill on and it will give you much more room and flexibility.

I use a 6' long, 3' wide plastic banquet table that folds in half (3'x3'). I open it up and put my weber Q100 and a two burner coleman propane stove and still have room to put a serving tray and my tongs, spoon for stirring whatever is on the stove. Very nice "outdoor kitchen" which we use all the time instead of the inside kitchen unless it's raining hard enough I can't have the awning open.