Can 9560/9260ac be added on my xps15？

For future reference, you should really include the generation of your system.  The XPS 15 model has had multiple generations spanning many years, so it's normally impossible to answer questions like this if all you say is that you have an XPS 15.  However, since I happen to know that the 8260 card was only ever available in the M.2 card form factor (not Mini-PCIe), which means that yes a 9560AC card in the M.2 form factor should absolutely work.  As for WiGig, I believe (but am not certain) that requires a different kind of antenna, but I'm also not sure why you'd want it.  That standard never really caught on and I don't see anybody making WiGig docks anymore.  You'd be better off with a Thunderbolt dock, assuming your XPS 15 model has a Thunderbolt 3 connector.

Thank you for answering my question.

My laptop model is 9550

maybe I should try the 9260ac on it.