Agilex 5 Power

Hello, I am using two A5EC043BB32AI4S devices and I am now planning their power rails. I have two questions.

1. Is it possible to design one power supply (one regulator) per rail for both FPGASs
2. There is a requirement in the PCB Design Guideline  User Guide for ‘Recommended VR Accuracy (% of Vnom)’ of ±0.5%.
   What is the meaning of this requirement?
   As I understand it, this refers to the Voltage accuracy (excluding line regulation and load regulation).
   This is a very strict requirement, and most power regulators cannot meet it.
   What is the practical meaning or impact of not meeting this requirement?

   In the datasheet, however, only a maximum value is specified, and it is usually around 3%.

   P.S:the requirement  of the  ±0.5%.are in  table 24 in PCB Design Guidelines (HSSI, EMIF,MIPI, True Differential, PDN) User Guide