How to fix double glass door to concrete floor
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Welcome to the Bunnings Workshop community @Tim06. It's wonderful to have you join us, and many thanks for your question about installing sliding glass doors.
Were there any instructions from the manufacturer about how the door was to be installed? It's my understanding that you would generally block up under the door to level it with packing shims. A couple of thick beds of weatherproof caulking also need to be applied on the concrete to seal under the frame. When the frame is level, and you've checked its diagonals for plumb, you can screw through the side jambs into either your brickwork or timber frame. I believe sliding doors frames/jambs are seldom fixed through their top or the bottom into a concrete floor.
Please let me know if you have any questions.
Everything I have seen is side fix.
The exception being sliding doors without frames that use top and bottom rails but that is mostly industrial sheds.