Two energy meters with single UPS

I have two digital energy meters; one on ground floor and another on first floor. UPS is connected on ground floor Neutral is common for UPS and wapda. Now i want to share my UPS with first floor as well.
meters are connected on same transformer.

so the suggestion and help needed for following question

  1. can i connect neutral of both meters output and UPS common??
  2. if I use only one neutral from ground floor meter for both floors and leave another energy meter phase for first floor some of the load will it effect on on both the meters?
  3. If i take the phase from one meter and neutral from another which meter will show units?

someone told that these meters are also run on neutral only

waiting for the response from experts