From last tourney's practice:
Usually, each should take their own snapshots while it's their turn, because this the best evidence of the conditions by the grid shown.
If one has troubles doing so, the other may jump in. (*)
For the stats, one is enough because it contains both players. If both do so, there is a redundancy for mishaps.
I suppose the spreadsheet form to enter the data of a round will be available again. (*)
(*) subject to approval by the Committee