Suggestion......
Suggest that you drill a small pilot hole first from the outside (i.e. the drill bit only, on the hole saw) and then remeasure your position on the inside. If any adjustments to the larger hole have to be done, that option is still available. Sometimes a permanently installed bracket, wire, or line is hidden under that upholstery. I learned the hard way once, on an airplane! Just don't rush anything.
