PCB guidelines for the PS-GTR transceivers can be found in PS-GTR Transceiver Interfaces. The guidelines include decoupling capacitors and a design checklist.
PCB design guidelines for GTY transceivers can be found in the Board Design Guidelines chapter of UltraScale Architecture GTY Transceivers User Guide (UG578) [Ref 7]. The guidelines include decoupling capacitors and a design checklist.