There are few options like -
- Tube pins push into 2 parallel slot sockets and something support the tube itself
- Tube held in by c clamps and the sockets are just a connector with 2 holes on wires, that plug onto the ends of the tube
Slimlines can use spring loaded sockets where the lamp is pushed into 1 socket on a spring and then can be inserted into the other
But on the slimline sockets, there is plastic around it, so you can't just push the tube in, or the sockets will have to move for the lamp.