Hi, I think it depends on your audience using this report. If you're trying to show proofs pending my review, you'll want the approver home group. If you're wanting proof owners keeping track of what proofs they still have out pending others' review, you'll want a separate report for requester home group. I've used both for approvers vs requesters.
You may not want to tie it to the home group of the project owner (assuming you mean owner here, not sure what else) bc that may not always give you results you want based on how you have owners vs proof approvals within the project.
Something else in terms of what I've found helpful in a proof approval report is having a column with a proof link directly to open the proof. Here is the text mode for that:
displayname=Proof Link
textmode=true
valueexpression=CONCAT("https://YOURDOMAIN.my.workfront.com/document/",{documentVersion}.{document}.{ID},"/proof/",{documentVersion}.{proofID},"/view")
valueformat=HTML
And having a column for the most recent proof comment/who said it/when:
column.6.displayname=Most Recent Proof Comment
column.6.linkedname=documentVersion
column.6.namekey=view.relatedcolumn
column.6.namekeyargkey.0=documentVersion
column.6.namekeyargkey.1=documentID
column.6.sharecol=true
column.6.textmode=true
column.6.valuefield=documentVersion:document:project:lastNote:noteText
column.6.valueformat=HTML
column.7.sharecol=true
column.7.textmode=true
column.7.value=<br>
column.7.valueformat=HTML
column.7.width=1
column.8.displayname=Most Recent Proof Comment Owner
column.8.linkedname=documentVersion
column.8.namekey=view.relatedcolumn
column.8.namekeyargkey.0=documentVersion
column.8.namekeyargkey.1=documentID
column.8.sharecol=true
column.8.textmode=true
column.8.valuefield=documentVersion:document:project:lastUpdatedBy:name
column.8.valueformat=HTML
column.9.sharecol=true
column.9.textmode=true
column.9.value=<br>
column.9.valueformat=HTML
column.9.width=1
column.10.displayname=Most Recent Proof Comment Date
column.10.linkedname=documentVersion
column.10.namekey=view.relatedcolumn
column.10.namekeyargkey.0=documentVersion
column.10.namekeyargkey.1=documentID
column.10.textmode=true
column.10.valuefield=documentVersion:document:project:lastUpdateDate
column.10.valueformat=HTML