The provided XDC uses placement constraints to specify the serial transceiver that is used when the core is implemented. This can be moved around according to the application.
set_property LOC GTPE2_CHANNEL_X0Y4
[get_cells get_cells */*/*/transceiver_inst/gtwizard_inst/*/GTWIZARD_i/gt0_GTWIZARD_i/gtpe2_i