HI Vince-
The installation method you mentioned sounds fine to me.  Personally, I
prefer setting the package in the hive next to 5 frames and setting the
queen cage right there on top of the package where the bees are exiting
(adjacent to feeder-can hole).  No dumping, squashing, or en
masse-disoriented flight.  The bees naturally go "up" to exit and so come
in contact with q cage right away to keep her warm.  If you do invert the
cage over the inner cover, I'd make sure the q cage is right near where
they will be coming down into the hive.  Probably between 2 frames right
under the inner cover hole, candy end up.  You'll have to devise a way to
make sure the q cage doesn't fall down in between the frames as you
reassemble the hive and plunk on the package proper.  (It might be tricky
to invert the package over the inner cover hole without dumping some bees
which will get mashed and not be able to make it down thru the hole as the
package will cover it.)  I've never trusted direct release of queen, just
seems risky, but I do make a good nail hole thru candy in cage unless alot
of the candy is already gone.  Let me know how your method works out...
and if you try direct queen release.   I hope the new bees get you a bumper
crop their first season.                           Joel
 
P.S.  You probably are already planning this, but 2-4 weeks after
installation give each package colony a frame or two of sealed brood with
bees from your established hives (which by then could use some "pruning"
against swarming anyway).  It will really give the new ones a great boost,
and help them over the population crash that occurs before the new queens'
youngsters start emerging.