How can I install mini aluminium heatsink to wireless card?
If you look again at those heatsinks you linked you'll see that they have an adhesive pad on the bottom for precisely this purpose.

I've used those without any issues in light duty applications. If you want it to be more secure, you can add a metal clip of some kind that grabs the edges of the pcb, and passes between the fins of the heatsink. That will be extremely secure and also provide some contact pressure.