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Yes, you will need to have the tags in the same array formula (your first suggestion).
For more information about bulk calls (from Data Link 2015 user guide):
The following conditions must be satisfied to make a bulk call:
- Function inputs specify data items, and not expressions or filter expressions
- Function input specifies data items with a reference to a cell range
- PI DataLink settings specify time stamps in client time zone
With the above conditions satisfied, the following functions make bulk calls:
- Current Value
- Archive Value
- Calculated Data (without time interval specified)
PI DataLink returns values from a bulk call in a single function array.