You should get specialist advice on fitting locks to patio doors. They should have special locks fitted top and bottom unless fitted with a multi-locking system. Also install an anti-lift device to stop a thief simply lifting the door off its rail. Fit security mortice locks to french doors, and mortice bolts to the top and bottom of both doors.
With all security, consideration must be given to the risk of fire, and means of escape. Fit a smoke detector, conforming to BS5446.