I've done it both ways; never could tell a difference i.e. no leaks.
BUT, I just did this last night as I was installing a y-pipe.
I put the gaskets flat side up towards the manifolds AND I lightly held them there with some of that blue painters tape while I got all the nuts loosely installed(apply liberal amounts of silver grease!)
Then I wiggled the tape free, tightened all the bolts up.
Gaskets didnt fall off or move around!
Real Rovers have round headlights!
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Just a few miles from 4x4 access!