The UPPAbaby Mesa V3 attaches straight to the UPPAbaby Cruz V2; there is nothing extra to buy. With the carrier on, you are pushing about 35.4 lb (25.5 lb stroller, 9.9 lb carrier). The seat itself is rated up to 30 lb and up to 32 in, per UPPAbaby.
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32 other infant seats fit the UPPAbaby Cruz V2; UPPAbaby Aria V2, UPPAbaby Mesa (original), UPPAbaby Mesa Max and 1 more need no adapter at all.
Summary from the makers' published data.
How to set up the UPPAbaby Mesa V3 on the UPPAbaby Cruz V2
What you need
The UPPAbaby Cruz V2
The UPPAbaby Mesa V3 carrier (its car base stays in the car)
The UPPAbaby carrier attaches straight to the stroller frame; the manuals below show exactly where.
Before every walk
Check that the carrier is locked on both sides the way your manual describes. How we check our answers
Last check: give the carrier handle a gentle tug. A seat that is fully latched does not lift off.